11. African Burial Ground, Manhattan
The African Burial Ground in Lower Manhattan isn’t as “hidden” as most of the other cemeteries on this list, but is still on the small side since it only has about 420 gravestones. The land contains the bodies of both free and enslaved Africans that were buried there from the 1690s until about 1794. These grounds were lost for years, but unearthed in 1991 during construction over the site.