Kenneth Long pathway grave in section M 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. Inurnments (the burial of cremated remains) take up much less space. Inurnment plots at Prospect Hill often occur along pathways, where a small bronze or granite marker can be set flush with the earth but also easily found by mourners from the pathway.