Many graveyards in NYC are forgotten or have been removed. https://www.6sqft.com/what-lies-below-nycs-forgotten-and-hidden-graveyards/ https://www.6sqft.com/wh

Many graveyards in NYC are forgotten or have been removed. https://www.6sqft.com/what-lies-below-nycs-forgotten-and-hidden-graveyards/ https://www.6sqft.com/what-lies-below-nycs-forgotten-and-hid... Eventually, most graveyards will simply erode away. The average erosion rate is 0.2 mm/year, so 2 meters down will be exposed in about 10,000 years. YMMV