Built between the 12 and 16C, the cathedral is a detailed example of the evolution of Gothic style. The interior is a contrast to the heavily eroded exterior. The height and brilliance of the nave and exceptional elevation of the twin side-aisles are..

It was thought to have been the chapter's tithe barn. The outer covered staircase dates from the Renaissance era. The ground floor, joined to the cathedral by a wooden gallery, is now used as the sacristy and an annexe gallery.

Opening onto the watchpath is the 17C pavilion where Bossuet liked to be alone at night to meditate or write. A fine view of the garden, bishops' house and cathedral.

The former bishops' house, built in the 12C and modified in the 17C, contains a museum, partly devoted to Bossuet. It has fine French paintings from the 17 and 18C, a portrait of Bossuet by Mignard, medieval sculptures and also relates the history of..