Garden and plaque in Chapel Circle 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. A chapel was built on Chapel Circle in 1900. It lasted until at least 1950, but was later torn down. Pathways, a small brick plaza, and a circular garden surrounded by a low stone wall exist here now. A memorial plaque was placed in the garden in 1997.