Looking north at the intersectino of the North Capitol Street and V Street NE walls with their cornerstone at Prospect Hill Cemetery in Washington, D.C., in the United States in 2014. Prospect Hill Cemetery was added to the Register of Historic Places of the District of Columbia (a listing of historic sites maintained by the city) in 2005. The cornerstone is dated 1917, which is the date the North Capitol Street wall was constructed. The V Street wall, which is of a different style and material, was built in 1939.