African Burial Ground National Monument New York , New York

From about the 1690s until 1794, both free and enslaved Africans were buried in a 6.6-acre burial ground in Lower Manhattan, outside the boundaries of the settlement of New Amsterdam, later known as New York. Lost to history due to landfill and development, the grounds were rediscovered in 1991 as a consequence of the planned construction of a Federal office building.