John Carroll

Historical marker location:

3700 O Street Northwest, Georgetown, District of Columbia

( Marker can be reached from Carroll Walk south of Old N Way, on the left when traveling south.)

(1735-1815).

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.