Crypt of the Capucin Monks 4000 skeletons taken apart and rearranged into “art”. Circa 1500 AD. Kind of macabre.
The Catacombs of Rome: 100s of miles of tunnels and tens of thousands of tombs. By law no one could be buried within the Walls of Rome so tunnels were dug outside the city to house the dead. Many of these were raided by the Barbarians in the Middle Ages in search of riches. Construction circa 100-500 AD