Beyond the AEF

Historical marker location:

1400 Pennsylvania Avenue NW, Federal Triangle, District of Columbia

( Marker is on Pennsylvania Avenue Northwest just west of 14th Street Northwest, in the median.)

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.