Historical Marker
Mercury
Historical marker location:
600 Independence Southwest, The National Mall, District of Columbia
( Marker is on Jefferson Drive Southwest west of 4th Street Southwest, on the right when traveling east.)
Marker installed: 2013
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.