The magnificent Dom St Peter und St Paul was built in the 11th and 12th centuries in the late-Romanesque style. Inside, the lofty dimensions impress as much as the lavish, canopied high altar (1742) in the east choir, designed by the baroque master Balthasar Neumann. In the south transept, a scale model shows the enormity of the original complex. Nearby stairs lead down to the stuffy crypt , which holds the stone sarcophagi of several members of the Salian dynasty of Holy Roman emperors.