> probably more since no one wants to be turning 500-year old graves into farmland. In Manhattan, the place that is now Washington Square Park was once the loc

> probably more since no one wants to be turning 500-year old graves into farmland. In Manhattan, the place that is now Washington Square Park was once the location of mass graves for people who died of yellow fever during an epidemic. Before that, it was used as farmland. That said, this is far from the norm in the US - New York is one of the few places where this could happen, due to the scarcity of space, and it's also unclear whether people remembered the locations of the graves at the time the park was constructed.