(Washington, DC) — A northwest DC park that was built over two cemeteries will soon have signs honoring some of the people who were buried there. The city will hold a ceremony on September 7th to unveil the new signs at Walter Pierce Park. The two cemeteries closed in the 1890s and city officials once believed that all the graves had been moved decades ago. An effort by DC residents and Howard University anthropologists found the grave sites in 2005. The new signs will pay tribute to more than eight-thousand Quakers and African Americans who were buried in the cemeteries before they were closed.