The largest known colonial burial ground for people of African descent in the United States — both free and enslaved — is in New York City. That burial ground in Lower Manhattan is a national park and monument that commemorates the forgotten and brutal history of slavery in New York City. But it’s far from the only site of this complex past.

Producer Leina Gabra takes us to Flatbush, Brooklyn in New York, where a group of community activists are uncovering the history that laid below a corner of their neighborhood.