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  2. National Register of Historic Places listings in Pennsylvania

    en.wikipedia.org/wiki/National_Register_of...

    Also, the counts in this table exclude boundary increase and decrease listings which modify the area covered by an existing property or district and which carry a separate National Register reference number. 16 percent of the NRHP's in Pennsylvania are in Philadelphia, and nearly 40 percent are located within the Delaware Valley.

  3. List of Pennsylvania state historical markers - Wikipedia

    en.wikipedia.org/wiki/List_of_Pennsylvania_state...

    A city style marker in Philadelphia, the state's largest city Clickable map of Pennsylvania counties. This is a list of Pennsylvania State Historical Markers which were first placed by the Commonwealth of Pennsylvania in 1914 and are currently overseen by the Pennsylvania Historical and Museum Commission (PHMC) as part of its Historical Markers Program.

  4. Boundary markers of the original District of Columbia

    en.wikipedia.org/wiki/Boundary_Markers_of_the...

    Map of the boundary stones. The District of Columbia (initially, the Territory of Columbia) was originally specified to be a square 100 square miles (260 km 2) in area, with the axes between the corners of the square running north-south and east-west, The square had its southern corner at the southern tip of Jones Point in Alexandria, Virginia, at the confluence of the Potomac River and ...

  5. Category:Pennsylvania state historical markers - Wikipedia

    en.wikipedia.org/wiki/Category:Pennsylvania...

    Pages in category "Pennsylvania state historical markers" The following 72 pages are in this category, out of 72 total. This list may not reflect recent changes .

  6. List of National Historic Landmarks in Pennsylvania - Wikipedia

    en.wikipedia.org/wiki/List_of_National_Historic...

    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 ...

  7. District of Columbia (until 1871) - Wikipedia

    en.wikipedia.org/wiki/District_of_Columbia...

    The new capital district was at about the center of the country. About 2/3 of the original district was in Maryland and 1/3 in Virginia, and the wide Potomac in the middle. The future district was surveyed in 1791–92; 24 of its surviving stone markers are in Maryland, 12 in Virginia. (See Boundary Markers of the original District of Columbia.)

  8. National Register of Historic Places listings in Columbia ...

    en.wikipedia.org/wiki/National_Register_of...

    This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Columbia County, Pennsylvania, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a map.

  9. Kalorama Triangle Historic District - Wikipedia

    en.wikipedia.org/wiki/Kalorama_Triangle_Historic...

    Despite the new bridge and widening of Columbia Road, real estate development was somewhat slow in Kalorama Triangle until the 1890s. [5]: 38–41 [6] This was due in part to the Panic of 1893 and Highway Act of 1893, which required L'Enfant Plan street layouts to be followed in the former Washington County. After an exemption for existing ...