Can you hear the echo of the water bouncing off the rock?

Historical marker location:

339 Maryland Avenue Southwest, The National Mall, District of Columbia

( Marker can be reached from Jefferson Drive Southwest west of 3rd Street Southwest, on the right when traveling east.)

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.