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The Sedlec Ossuary is a chapel in Sedlec, a small town in the Czech Republic. The chapel is most famous for its macabre decorations made from thousands of human bones, making it one of the most popular tourist spots in the Czech Republic. The Sedlec Ossuary is a Vesper stronghold, used as an initiation site for the organization's new members. One member, Arthur Trent, was initiated at the Ossuary in November 1977, and his children, Amy and Dan Cahill, visited decades later during the Cahill fight against the Vespers.
The stronghold is features on Card 273: Sedlec Ossuary.