The Church of Our Lady was built on a model found in the Champagne region of France with two three-sided side chapels, interposed between the four apses, creating a 12-petalled roseate shape. Both the tympanum over the west porch, which depicts the Virgin Enthroned, the Annunciation and the Adoration of the Magi, and the sculpted tomb of bishop Karl von Metternich are worthy of note.