The United States Treasury

Historical marker location:

1500 Pennsylvania Avenue, Downtown Washington, District of Columbia

( Marker is on 15th Street Northwest north of Pennsylvania Avenue Northwest, on the right when traveling south.)

Civil War to Civil Rights. Downtown Heritage Trail

The city was built on a swamp: The area that is now Washington, D.C. was originally a swampy, marshy region along the Potomac River. The construction of the city involved extensive drainage and landfill projects to make the land suitable for building.