The Brooklyn Historical Society has lots of cool old maps, the latest of which it posted yesterday. It's Brooklyn Borough Historian (1944-71) James A. Kelly's 1946 "Indian villages, paths, ponds, and places in Kings County" map, and in addition to known Native American settlements in the borough and the routes connecting them, it also situates a major burial ground smack in the middle of brownstone Brooklyn.
That's right, somewhere between the northern tip of the Gowanus Canal and Atlantic Avenue, and between Fourth Avenue and Smith Street, there's a Native American burial ground. A note to Boerum Hill residents: don't bury your dead pets (or deceased loved ones) in your backyard, you never know what might happen.
Check out the map in full detail here.