Daniel Patrick Moynihan Place

Historical marker location:

1300 Pennsylvania Avenue Northwest, Federal Triangle, District of Columbia

( Marker is on Pennsylvania Avenue Northwest east of 13th Street Northwest, on the right when traveling east.)

Ronald Reagan Building and International Trade Center

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.