Mary Ann Shadd Cary House
Historical marker location:
1421 W St NW, U Street Corridor, District of Columbia
( Marker is on W Street Northwest west of 14th Street Northwest, on the left when traveling east.)
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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.