Pennsylvania Avenue
Historical marker location:
935 Pennsylvania Avenue Northwest, Penn Quarter, District of Columbia
( Marker is at the intersection of Pennsylvania Avenue Northwest and 10th Street Northwest, on the right when traveling west on Pennsylvania Avenue Northwest.)
Civil War to Civil Rights. Downtown Heritage Trail
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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.