The church's impressive square tower surveys the cathedral forecourt. Built around an early-9C rotunda (fortified), it is supported by eight columns. The crypt is Carolingian.

This formerly Renaissance castle was extended and rebuilt in the early 18C as a residence of the prince-bishops of Fulda. The apartments and the Imperial and Princes' Halls are open to the public. The rooms are adorned with lavish stucco; paintings..

From 1704, this church was rebuilt in an Italian Baroque style. Pilgrims still worship the tomb of St Boniface in the crypt under the high altar. At the base of the funerary monument, an 18C alabaster low-relief represents the saint raising his tombs..