U.S. Department of Housing and Urban Development Oklahoma City Bombing Memorial

Historical marker location:
451 7th Street Southwest, Southwest Federal Center, District of Columbia
( Marker is on D Street Southwest west of 7th Street Southwest, on the right 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.