United Mine Workers of America Building
Historical marker location:
900 15th Street Northwest, Downtown Washington, District of Columbia
( Marker is at the intersection of 15th Street Northwest and I Street Northwest, on the right when traveling south on 15th Street Northwest.)
Marker installed: 2005
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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.