Beneath the modest Capuchin church on Neuer Markt lies the burial place of 145 members of the Habsburg dynasty, from the Thirty Years' War to the present day. The Kaisergruft has been used continuously since 1633 and is divided into ten vaults that grow progressively more theatrical: simple stone tombs give way to enormous rococo sarcophagi.
Maria Theresa's tomb is the show-stopper — a vast double sarcophagus in pewter and tin sharing the space with her husband Franz Stephan. Empress Elisabeth ('Sisi') and her son Crown Prince Rudolf are also here. Open daily; entry around 8 euros.