The Heider-Wagner family plot in section Circle-Right North 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. Many Heiders are buried at Prospect Hill Cemetery. This memorial, sculpted to look like broken rock with ferns, lichen, and ivy growing from it, is one of the more unique grave markers.