Across the street from the Ossuary you’ll find another UNESCO listed cathedral, the Cathedral of the Assumption of Our Lady and St John the Baptist. Completed in 1320, it was in ruins for almost 300 years after it was plundered by the Hussites in 1421. It got a baroque-gothic facelift in 1709 from builder Jan Blažej Santini-Aichel who tastefully preserved its original gothic atmosphere. Unusual features Santini added are the self-supporting vault and the self-supporting staircase. In the cathedral’s so-called “inner circle” an animated film about the cathedral’s history is screened and you’ll also view the treasury which includes the Sedlec monstrance, one of the oldest gothic monstrances in the world.