Its remains are now administered by the National Park Service as part of the George Washington Memorial Parkway in Fairfax County, Virginia.

It is a relatively undisturbed fort and was named in honor of a native of Massachusetts, Randolph B. Marcy, a distinguished soldier, father-in-law and chief of staff to General George B.

An interesting incident of history is that the body of troops which afterwards became famous as the "Iron Brigade" was originated at this fort in the summer of 1861, and was composed of the 19th Indiana, the 2nd, 6th and 7th Wisconsin Regiments.

At the end of the Civil War in 1865, the system of fortifications (now known as Fort Circle Parks) which surrounded Washington, D.C. were dismantled.

The body of former deputy White House Counsel Vince Foster was found in Fort Marcy Park following his death on July 20, 1993.