This national monument in Lower Manhattan is the excavation site of over 400 African-Americans buried in the 17th and 18th Centuries during the era of slavery in the settlement of New Amsterdam. The bodies were discovered in 1991 during construction of a federal office building at 290 Broadway, which is now home to the monument's visitor center. There are an estimated 200 bodies still buried under the monument. The African Burial Ground Monument also functions as a memorial site, which was built in 2007. The memorial itself is located at the burial ground on the corner of Duane and Elk Streets.