Jan Karski (n. Jan Kozielewski) (1914-2000)

Historical marker location:

3700 O Street Northwest, Georgetown, District of Columbia

( Marker can be reached from the intersection of 37th Street Northwest and P Street Northwest, on the left when traveling north.)

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.