9/11 Memorial

Historical marker location:

301 7th Street SW, Southwest Federal Center, District of Columbia

( Memorial is at the intersection of 7th Street Southwest and Virginia Avenue Southwest, on the right on 7th Street Southwest.)

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.