List of National Historic Landmarks in Pennsylvania

This is a List of National Historic Landmarks in Pennsylvania. There are 169 in the state. Listed in the tables below are the 102 NHLs outside Philadelphia. For the 67 within Philadelphia, see List of National Historic Landmarks in Philadelphia.

Three of these sites are shared with other states and are credited by the National Park Service as being located in those other states: the Delaware and Hudson Canal (centered in New York but extending into Pennsylvania); the Beginning Point of the U.S. Public Land Survey (on the Ohio–Pennsylvania border); and the Minisink Archeological Site, on the New Jersey-Pennsylvania border.

National Historic Landmarks in Pennsylvania (excluding Philadelphia)

Following are National Historic Landmarks in Pennsylvania, but outside Philadelphia. For consistency, the National Historic Landmark name is used to label each one.

[1]	Landmark name	Image	Date designated[2]	Location	County	Description
1	1762 Waterworks	1762 Waterworks	May 29, 1981 (#72001142)	Bethlehem 40°37′09″N 75°23′00″W	Northampton	The oldest municipal waterworks in the nation.
2	Edward G. Acheson House	Edward G. Acheson House	May 11, 1976 (#76001679)	Monongahela 908 Main St. 40°12′20″N 79°56′02″W	Washington	Home of self-taught inventor-engineer Edward G. Acheson, where in 1891 he invented carborundum.
3	Allegheny County Courthouse and Jail	Allegheny County Courthouse and Jail	May 11, 1976 (#73001586)	Pittsburgh 436 Grant Street 40°26′18″N 79°59′46″W	Allegheny	Spectacular jail and courthouse designed by architect Henry Hobson Richardson in a Romanesque style.
4	Allegheny Portage Railroad of the Pennsylvania Canal	Allegheny Portage Railroad of the Pennsylvania Canal	December 29, 1962 (#66000648)	Johnstown 40°27′15″N 78°32′25″W	Blair	Railroad that transported canalboats over the Allegheny Mountains, between the eastern and western sections of the Pennsylvania Canal; regarded as a technological marvel.
5	Andalusia	Andalusia	November 13, 1966 (#66000649)	Andalusia 40°03′43″N 74°57′30″W	Bucks	Greek Revival residence of Nicholas Biddle, head of the Second Bank of the United States.
6	Henry Antes House	Henry Antes House	April 27, 1992 (#75001657)	Pottstown 40°17′25″N 75°32′26″W	Montgomery	Headquarters of George Washington, September 23 to 26, 1777.[3]
7	Augustus Lutheran Church	Augustus Lutheran Church	December 24, 1967 (#67000019)	Trappe 40°12′03″N 75°28′50″W	Montgomery
8	Bedford Springs Hotel Historic District	Bedford Springs Hotel Historic District	July 17, 1991 (#84001413)	Bedford 39°59′47″N 78°30′28″W	Bedford
9	Beginning Point of the U.S. Public Land Survey	Beginning Point of the U.S. Public Land Survey	June 23, 1965 (#66000606)	Ohioville, PA and East Liverpool, OH 40°38′26″N 80°31′10″W	Beaver, PA and Columbiana, OH
10	Beth Sholom Synagogue	Beth Sholom Synagogue	March 29, 2007 (#07000430)	Elkins Park 8231 Old York Road 40°04′56″N 75°07′36″W	Montgomery	Frank Lloyd Wright designed it. The American Institute of Architects and National Trust for Historic Preservation commented upon it.
11	Bomberger's Distillery	Bomberger's Distillery	January 16, 1980 (#75001649)	Newmanstown 40°16′30″N 76°19′13″W	Lebanon
12	Bost Building	Bost Building	January 20, 1999 (#99000627)	Homestead 621–623 East 8th Avenue 40°24′33″N 79°54′16″W	Allegheny	Headquarters of the Amalgamated Association of Iron and Steel Workers during the Homestead Strike.
13	Braddock Carnegie Library	Braddock Carnegie Library	March 2, 2012 (#73001585)	Braddock 40°24′07″N 79°51′56″W	Allegheny	First Carnegie library built in the United States.
14	David Bradford House	David Bradford House	July 28, 1983 (#73001668)	Washington 175 S. Main St. 40°10′06″N 80°14′41″W	Washington	A home of David Bradford.
15	Brandywine Battlefield	Brandywine Battlefield	January 20, 1961 (#66000660)	Chadds Ford 39°52′31″N 75°34′31″W	Delaware	Site of the 1777 Battle of Brandywine.
16	William Brinton 1704 House	William Brinton 1704 House	December 24, 1967 (#67000018)	Dilworthtown 39°53′40″N 75°33′40″W	Delaware
17	Bryn Athyn Historic District	Bryn Athyn Historic District	October 6, 2008 (#08001087)	Bryn Athyn 40°08′04″N 75°03′48″W	Montgomery
18	James Buchanan House (Wheatland)	James Buchanan House (Wheatland)	July 4, 1961 (#66000669)	Lancaster 40°02′37″N 76°19′45″W	Lancaster	Home of James Buchanan while he was President and in his final years.
19	Pearl S. Buck House	Pearl S. Buck House	January 16, 1980 (#74001755)	Perkasie 520 Dublin Rd. 40°21′36″N 75°13′11″W	Bucks	A home of author Pearl S. Buck.
20	Buckingham Friends Meeting House	Buckingham Friends Meeting House	July 31, 2003 (#97000291)	Buckingham Township 5684 Lower York Road 40°20′56″N 75°02′27″W	Bucks	Associated with the Religious Society of Friends (Quakers).
21	Bushy Run Battlefield	Bushy Run Battlefield	October 9, 1960 (#66000696)	Harrison City 2 miles E. of Harrison City on Pa. Rte. 993 40°21′19″N 79°37′12″W	Westmoreland	Site of the Battle of Bushy Run during Pontiac's Rebellion.
22	Cambria Iron Company	Cambria Iron Company	June 22, 1989 (#89001101)	Johnstown 40°20′10″N 78°55′23″W	Cambria
23	Simon Cameron House	Simon Cameron House	May 15, 1975 (#73001620)	Harrisburg 219 S. Front St. 40°15′23″N 76°52′45″W	Dauphin	A home of Simon Cameron who had some association under Abraham Lincoln.
24	Carlisle Indian School	Carlisle Indian School	July 4, 1961 (#66000658)	Carlisle 40°12′32″N 77°10′41″W	Cumberland	Associated with Native American education. Athlete Jim Thorpe attended.
25	Carrie Blast Furnaces 6 and 7	Carrie Blast Furnaces 6 and 7	September 20, 2006 (#06001070)	Rankin, Munhall, and Swissvale boroughs Northern side of the Monongahela River, 0.5 miles (0.80 km) west of the Rankin Bridge 40°24′47″N 79°53′24″W	Allegheny	The only 2 surviving pre-World War II blast furnaces in the Pittsburgh area.
26	Cedarcroft	Cedarcroft	November 11, 1971 (#71000693)	Kennett Square 39°51′28″N 75°43′09″W	Chester
27	Chatham Village	Chatham Village	April 5, 2005 (#98001372)	Pittsburgh Roughly bounded by Virginia Avenue, Bigham Street, Woodruff Street, Saw Mill Run Boulevard, and Olympia Road 40°25′52″N 80°01′01″W	Allegheny
28	Cornwall Iron Furnace	Cornwall Iron Furnace	November 3, 1966 (#66000671)	Cornwall Rexmont Rd. & Boyd St. 40°16′14″N 76°24′22″W	Lebanon
29	Delaware Canal	Delaware Canal	December 8, 1976 (#74001756)	Easton to Bristol Easton to Bristol along the Delaware River 40°05′36″N 74°51′41″W	Bucks and Northampton	Transported anthracite coal.
30	Delaware and Hudson Canal	Delaware and Hudson Canal	October 18, 1968 (#68000051)	Lackawaxen, PA, Honesdale, PA, Kingston, NY, Rosendale, NY, Ellenville, NY, and Port Jervis, NY 41°36′26″N 74°26′53″W	Pike, PA, Wayne, PA, Orange, NY, Sullivan, NY, and Ulster, NY
31	Drake Oil Well	Drake Oil Well	November 13, 1966 (#66000695)	Titusville 41°36′39″N 79°39′28″W	Venango	Edwin L. Drake struck oil here, the site of the world's first successful oil well.
32	East Broad Top Railroad	East Broad Top Railroad	January 28, 1964 (#66000666)	Rockhill 40°14′29″N 77°53′56″W	Huntingdon
33	Dwight D. Eisenhower Farmstead	Dwight D. Eisenhower Farmstead	May 23, 1966 (#67000017)	Gettysburg 39°47′36″N 77°15′48″W	Adams	A home of Dwight Eisenhower.
34	Emmanuel Episcopal Church	Emmanuel Episcopal Church	February 16, 2000 (#74001737)	Pittsburgh North and Allegheny Avenues 40°27′11″N 80°01′09″W	Allegheny
35	Ephrata Cloister	Ephrata Cloister	December 24, 1967 (#67000026)	Ephrata 40°10′59″N 76°11′21″W	Lancaster
36	Wharton Esherick House and Studio	Wharton Esherick House and Studio	April 19, 1993 (#73001615)	Malvern 40°05′02″N 75°29′38″W	Chester	Studio of Wharton Esherick who participated in the Arts and Crafts Movement.
37	David Espy House	David Espy House	July 28, 1983 (#74001750)	Bedford 40°01′09″N 78°30′11″W	Bedford	Associated with Whiskey Rebellion and David Espy.
38	Fallingwater	Fallingwater	May 11, 1976 (#74001781)	Mill Run 39°54′17″N 79°28′05″W	Fayette	Designed by Frank Lloyd Wright.
39	Fonthill, Mercer Museum and Moravian Pottery and Tile Works	Fonthill, Mercer Museum and Moravian Pottery and Tile Works	February 4, 1985 (#85002366)	Doylestown 40°19′23″N 75°07′25″W	Bucks	Three sites associated with Henry Chapman Mercer.
40	Forks of the Ohio	Forks of the Ohio	October 9, 1960 (#66000643)	Pittsburgh Point Park 40°26′27″N 80°00′37″W	Allegheny	Associated with French and Indian War.
41	Fulton Opera House	Fulton Opera House	January 29, 1964 (#69000156)	Lancaster 12–14 N. Prince St. 40°02′17″N 76°18′28″W	Lancaster	Named for Robert Fulton, it is one of the oldest continuously-operated theaters.
42	Robert Fulton Birthplace	Robert Fulton Birthplace	January 29, 1964 (#66000670)	Quarryville 8 mi. south of Quarryville on U.S. Route 22 39°48′17″N 76°09′37″W	Lancaster	Also associated with Robert Fulton.
43	Albert Gallatin House	Albert Gallatin House	January 12, 1965 (#66000663)	Point Marion 39°46′40″N 79°55′45″W	Fayette	A home of Albert Gallatin.
44	Gemeinhaus-Lewis David de Schweinitz Residence	Gemeinhaus-Lewis David de Schweinitz Residence	May 15, 1975 (#75001658)	Bethlehem 40°37′00″N 75°22′52″W	Northampton	A home of botanist Lewis David de Schweinitz.
45	Graeme Park	Graeme Park	October 9, 1960 (#66000672)	Horsham 40°13′00″N 75°09′00″W	Montgomery
46	Grey Towers	Grey Towers	February 4, 1985 (#80003578)	Glenside 40°04′46″N 75°09′54″W	Montgomery	Designed by Horace Trumbauer. Now part of Arcadia University.
47	Gruber Wagon Works	Gruber Wagon Works	December 22, 1977 (#72001092)	Reading 40°22′14″N 75°58′47″W	Berks	Located in what is now Tulpehocken Creek Park.
48	Historic Moravian Bethlehem Historic District	Historic Moravian Bethlehem Historic District	October 16, 2012 (#12001016)	Bethlehem 40°37′08″N 75°22′51″W	Northampton
49	I. N. and Bernardine Hagan House	I. N. and Bernardine Hagan House	May 16, 2000 (#00000708)	Chalk Hill 39°52′09″N 79°31′11″W	Fayette	A higher end Usonian house of those designed by Frank Lloyd Wright.
50	Harmony Historic District	Harmony Historic District	May 30, 1974 (#73002139)	Harmony 40°48′11″N 80°07′42″W	Butler	Associated with Harmony Society and George Rapp.
51	Harrisburg Station and Trainshed	Harrisburg Station and Trainshed	December 8, 1976 (#75001638)	Harrisburg 40°15′36″N 76°52′40″W	Dauphin	Pennsylvania Railroad station with sheds using truss system patented by Albert Fink.
52	Milton S. Hershey Mansion	Milton S. Hershey Mansion	May 4, 1983 (#78002388)	Hershey Mansion Road 40°17′18″N 76°38′39″W	Dauphin	A home of Milton Snavely Hershey.
53	Honey Hollow Watershed	Honey Hollow Watershed	August 4, 1969 (#69000155)	New Hope 40°22′26″N 75°00′27″W	Bucks
54	Horseshoe Curve	Horseshoe Curve	November 13, 1966 (#66000647)	Altoona 40°29′45″N 78°28′54″W	Blair	A horseshoe-shaped railroad track
55	Keim Homestead	Keim Homestead	December 23, 2016 (#100000832)	Pike Township 40°24′35″N 75°44′54″W	Berks
56	Kennywood Park	Kennywood Park	February 27, 1987 (#87000824)	West Mifflin 4800 Kennywood Boulevard 40°23′15″N 79°51′48″W	Allegheny	From trolley park era, One of America's first amusement parks.
57	Leap-The-Dips	Leap-The-Dips	June 19, 1996 (#91000229)	Altoona 700 Park Ave. 40°28′15″N 78°23′48″W	Blair	The oldest wooden rollercoaster still standing in the United States.
58	F. Julius Lemoyne House	F. Julius Lemoyne House	September 25, 1997 (#97001271)	Washington 49 E. Maiden St. 40°10′05″N 80°14′35″W	Washington	A home of F. Julius LeMoyne, involved with the Underground Railroad
59	Lightfoot Mill	Lightfoot Mill	April 5, 2005 (#73001616)	Chester Springs 40°04′53″N 75°38′40″W	Chester	See also Oliver Evans.
60	Lukens Historic District	Lukens Historic District	April 19, 1994 (#94001186)	Coatesville 50, 53, 76 & 102 S. First St. 39°58′52″N 75°49′21″W	Chester	Associated with Rebecca Lukens and Brandywine Ironworks (later Lukens Steel Company).
61	Humphry Marshall House	Humphry Marshall House	December 23, 1987 (#87002596)	Marshallton 1407 S. Strasburg Rd./PA Rte. 162 39°56′52″N 75°40′53″W	Chester	A home of Humphry Marshall.
62	Meadowcroft Rockshelter	Meadowcroft Rockshelter	April 5, 2005 (#78002480)	West of Avella 40°17′11″N 80°29′30″W	Washington	Archaeological site associated with Native Americans.
63	Isaac Meason House	Isaac Meason House	June 21, 1990 (#71000707)	Mount Braddock 39°57′14″N 79°38′53″W	Fayette	A home of Isaac Meason.
64	Merion Cricket Club	Merion Cricket Club	February 27, 1987 (#87000759)	Haverford 40°00′56″N 75°18′01″W	Montgomery	From when cricket competed with baseball for American attention.
65	Merion Friends Meeting House	Merion Friends Meeting House	August 5, 1998 (#98001194)	Merion Station 40°00′32″N 75°15′11″W	Montgomery
66	Merion Golf Club	Merion Golf Club	April 27, 1992 (#89002085)	Ardmore 39°59′36″N 75°19′35″W	Delaware	Associated with Bobby Jones, who won the Grand Slam of Golf here in 1930. Host of many U.S. Opens.
67	Mill Grove	Mill Grove	May 5, 1989 (#72001138)	Audubon 40°07′23″N 75°26′39″W	Montgomery	A home of John James Audubon.
68	Minisink Archeological Site	Minisink Archeological Site	April 19, 1993 (#93000608)	Bushkill 41°17′26″N 74°49′44″W	Pike	Prehistoric native site; extends into New Jersey.
69	George Nakashima Woodworker Complex	George Nakashima Woodworker Complex	April 23, 2014 (#08000782)	Solebury Township 40°20′25″N 74°57′20″W	Bucks	Art studio and home of woodworker George Nakashima
70	Oakmont Country Club	Oakmont Country Club	June 30, 1987 (#84003090)	Oakmont 40°31′33″N 79°49′36″W	Allegheny	Built 1903, one of the first top-caliber golf courses anywhere.
71	Old Economy	Old Economy	June 23, 1965 (#66000644)	Ambridge 40°35′46″N 80°13′59″W	Beaver	Associated with Harmony Society and George Rapp.
72	Old West, Dickinson College	Old West, Dickinson College	June 13, 1962 (#66000659)	Carlisle 40°12′10″N 77°11′42″W	Cumberland	Designed by Benjamin H. Latrobe, part of Dickinson College which was founded by Benjamin Rush. James Buchanan, later president, lived here.
73	Asa Packer Mansion	Asa Packer Mansion	February 4, 1985 (#74001765)	Jim Thorpe 40°51′52″N 75°44′18″W	Carbon	Designed by Samuel Sloan, home of Asa Packer, founder of the Lehigh Valley Railroad and Lehigh University.
74	Pennsylvania State Capitol Complex	Pennsylvania State Capitol Complex	September 20, 2006 (#77001162)	Harrisburg Bounded by 3rd and 7th, North and Walnut Streets 40°15′52″N 76°53′01″W	Dauphin	Includes the Pennsylvania State Capitol, North and South Office Buildings, Finance Building, Forum Building, State Street Bridge and Ryan Legislative Office Building. Originally listed with only the capitol, expanded in 2013 to encompass surrounding buildings.
75	Gifford Pinchot House	Gifford Pinchot House	May 23, 1963 (#66000694)	Milford 41°19′39″N 74°49′15″W	Pike	Home of Gifford Pinchot, first head of the U.S. Forest Service and two-time state governor.
76	Terence V. Powderly House	Terence V. Powderly House	May 23, 1966 (#66000667)	Scranton 41°25′06″N 75°40′29″W	Lackawanna	Longtime home of Terence Vincent Powderly, a Knights of Labor leader.
77	Joseph Priestley House	Joseph Priestley House	January 12, 1965 (#66000673)	Northumberland 40°53′17″N 76°47′25″W	Northumberland	Stately home of chemist Joseph Priestley, who, disenchanted with England moved here in 1794 and continued his ground-breaking research.
78	The Printzhof	The Printzhof	November 5, 1961 (#66000661)	Essington 39°51′33″N 75°18′11″W	Delaware	A home of Johan Printz.
79	Pulpit Rocks	Pulpit Rocks	November 4, 1993 (#93001614)	Huntingdon 40°31′09″N 78°02′43″W	Huntingdon
80	Matthew S. Quay House	Matthew S. Quay House	May 15, 1975 (#75001615)	Beaver 40°41′38″N 80°18′12″W	Beaver	A home of Matthew Stanley Quay, a Republican National Chairman who was campaign manager for Benjamin Harrison's successful presidential campaign.
81	St. Mark's Episcopal Church (Jim Thorpe)	St. Mark's Episcopal Church (Jim Thorpe)	December 23, 1987 (#77001135)	Jim Thorpe 40°51′47″N 75°44′18″W	Carbon
82	Searights Tollhouse, National Road	Searights Tollhouse, National Road	January 29, 1964 (#66000665)	Uniontown 39°56′43″N 79°47′40″W	Fayette	Tollhouses built in 1835 as part of the National Road.
83	Schaeffer House	Schaeffer House	July 25, 2011 (#11000630)	Schaefferstown 40°17′47″N 76°18′01″W	Lebanon	Possibly the only remaining German Weinbauernhaus in America, combining a residence with the production of alcohol.[4]
84	Smithfield Street Bridge	Smithfield Street Bridge	May 11, 1976 (#74001745)	Pittsburgh Smithfield Street at the Monongahela River 40°26′05″N 80°00′08″W	Allegheny	A truss bridge built between 1881 and 1883.
85	Staple Bend Tunnel	Staple Bend Tunnel	April 19, 1994 (#94001187)	Conemaugh Township 40°21′26″N 78°51′19″W	Cambria	The first railroad tunnel in the United States. Regarded as an engineering marvel.
86	Stiegel-Coleman House	Stiegel-Coleman House	November 13, 1966 (#66000668)	Brickerville 40°14′16″N 76°17′48″W	Lancaster	House built in parts by owner William Stiegel and then by Robert Coleman.
87	Summerseat	Summerseat	July 17, 1965 (#71000685)	Morrisville 40°12′27″N 74°46′44″W	Bucks	A home of George Clymer, a signer of the Declaration of Independence and the U.S. Constitution.
88	George Taylor House	George Taylor House	July 17, 1971 (#71000709)	Catasauqua Lehigh & Poplar Sts. 40°38′45″N 75°27′59″W	Lehigh	A home of George Taylor, a signer of the Declaration of Independence.
89	M. Carey Thomas Library	M. Carey Thomas Library	July 17, 1991 (#91002052)	Bryn Mawr 40°01′37″N 75°18′50″W	Montgomery	An architecturally significant building on Bryn Mawr College campus.
90	Union Canal Tunnel	Union Canal Tunnel	April 19, 1994 (#74001792)	Lebanon Tunnel Hill Road 40°20′58″N 76°27′42″W	Lebanon
91	Valley Forge	Valley Forge	January 20, 1961 (#66000657)	Valley Forge 40°05′49″N 75°26′20″W	Chester and Montgomery
92	Gen. Friedrich Von Steuben Headquarters	Gen. Friedrich Von Steuben Headquarters	November 28, 1972 (#72001108)	Valley Forge National Historical Park 40°05′49″N 75°28′13″W	Chester	Headquarters of drillmaster Baron Friedrich Wilhelm Ludolf Gerhard Augustin von Steuben who had served Frederick the Great. Now part of Valley Forge National Historical Park.
93	Washington's Crossing	Washington's Crossing	January 20, 1961 (#66000650)	Yardley, PA and Titusville, NJ 40°17′51″N 74°52′35″W	Bucks, PA and Mercer County, NJ	Pennsylvania location of George Washington's crossing of the Delaware River leading up to the Battle of Trenton on December 26, 1776, includes Washington Crossing State Park in New Jersey
94	Washington's Headquarters	Washington's Headquarters	November 28, 1972 (#73001655)	Valley Forge National Historical Park Valley Creek Rd., near junction of PA 252 & 23 40°05′58″N 75°27′43″W	Montgomery	Part of Valley Forge National Historical Park.
95	Waynesborough	Waynesborough	November 28, 1972 (#73001603)	Paoli 40°01′55″N 75°28′23″W	Chester	Home of General Anthony Wayne.
96	Conrad Weiser House	Conrad Weiser House	October 9, 1960 (#66000646)	Womelsdorf 40°21′33″N 76°10′26″W	Berks	A home of Johann Conrad Weiser, who enlisted the Iroquois on the British side of the French and Indian War.
97	Benjamin West Birthplace	Benjamin West Birthplace	December 21, 1965 (#66000662)	Swarthmore 39°54′18″N 75°21′05″W	Delaware	Birthplace of Benjamin West who supported artists including Gilbert Stuart and Charles Willson Peale. On campus of Swarthmore College.
98	Woodmont	Woodmont	August 5, 1998 (#98001192)	Gladwyne 1622 Spring Mill Rd. 40°03′48″N 75°17′29″W	Montgomery	Designed by William Lightfoot Price for industrialist Alan Wood, Jr.. Father Divine also lived here.
99	Woodville	Woodville	July 28, 1983 (#74001733)	Heidelberg South of Heidelberg on Pennsylvania Route 50 40°22′47″N 80°05′47″W	Allegheny	Home of John Neville, tax collector during the Whiskey Rebellion of 1794.
100	Andrew Wyeth Studio and Kuerner Farm	Andrew Wyeth Studio and Kuerner Farm	June 23, 2011 (#11000564)	Chadds Ford Township 39°52′09″N 75°34′32″W	Delaware	The Kuerner Farm was the inspiration for more than 1,000 Wyeth paintings over a 64-year period. Listing expanded (and renamed) in 2014 to include the studio of Andrew Wyeth.
101	N. C. Wyeth House and Studio	N. C. Wyeth House and Studio	December 9, 1997 (#97001680)	Chadds Ford Township 39°51′59″N 75°35′09″W	Delaware	Home and studio of painter N.C. Wyeth and family. Managed by the Brandywine River Museum.
102	W. A. Young and Sons Foundry and Machine Shop	W. A. Young and Sons Foundry and Machine Shop	December 23, 2016 (#100000839)	Rices Landing 39°56′59″N 79°59′57″W	Greene

See also

• National Register of Historic Places listings in Pennsylvania
• List of National Historic Landmarks by state
• List of National Historic Sites in United States
• List of Pennsylvania state historical markers

References

1. Numbers represent an alphabetical ordering by significant words. Various colorings, defined here, differentiate National Historic Landmarks and historic districts from other NRHP buildings, structures, sites or objects.
2. The eight-digit number below each date is the number assigned to each location in the National Register Information System database, which can be viewed by clicking the number.
3. General Orders, 23 September 1777 from the National Archives.
4. http://www.doi.gov/news/pressreleases/AMERICAS-GREAT-OUTDOORS-Secretary-Salazar-Designates-Four-National-Historic-Landmarks.cfm NHL announcement

External links

• "National Register Information System". National Register of Historic Places. National Park Service. July 9, 2010.
• Pennsylvania's Cultural Resources Geographic Information System
• Listings at NationalRegisterofHistoricalPlaces.com