What’s the history of this weird building? The Sedlec Ossuary dates back to the 13th century when a guy named Abbot Henry brought back some dirt from his pilgrimage to the Grave of the Lord in Jerusalem. According to legend, he sprinkled the holy dust across the Sedlec graveyard. People from all over the region and surrounding countries heard about it, and then everyone and their medieval uncle wanted to secure a burial plot there. More than 30,000 people managed to secure plots on the land where the holy dirt was scattered. But this was the era of plagues and no antibiotics, so pretty soon the area was exhausted, and they couldn’t fit any more dead people there. The bodies were placed into a nearby crypt once the land ran out.