The Sedlec Ossuary (Czech: Kostnice v Sedlci) is a small Roman Catholic chapel, located beneath the Cemetery Church of All Saints (Czech: Hřbitovní kostel Všech Svatých) in Sedlec, a suburb of Kutná Hora in the Czech Republic. It is one of twelve World Heritage Sites in the Czech Republic. The ossuary is estimated to contain the skeletons of between 40,000 and 70,000 people, whose bones have in many cases been artistically arranged to form decorations and furnishings for the chapel. The ossuary is among the most visited tourist attractions of the Czech Republic, attracting over 200,000 visitors yearly.
Four enormous bell-shaped mounds occupy the corners of the chapel. An enormous chandelier of bones, which contains at least one of every bone in the human body, hangs from the center of the nave with garlands of skullsdraping the vault. Other works include piers and monstrances flanking the altar, a coat of arms of House of Schwarzenberg, and the signature of Rint, also executed in bone, on the wall near the entrance.