First International Manned Space Mission

Historical marker location:

The National Mall, District of Columbia

( Marker is on 7th Street Southwest south of Jefferson Drive Southwest, on the right when traveling north.)

Marker installed: 1994

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.