Dr. Edgar J. Helms

Historical marker location:

515 15th Street Northwest, Penn Quarter, District of Columbia

( Marker is on 15th Street Northwest north of Pennsylvania Avenue Northwest, on the right when traveling north.)

The Extra Mile. Points of Light Volunteer Pathway

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.