The Collegiate Church of St. Servatius crowns the Schlossberg like a statement of intent — two square towers visible from everywhere in the lower town, a reminder that this modest-looking place was once a seat of imperial power. The interior is austere and all the better for it: pale sandstone, round arches, and a crypt that feels genuinely ancient.
The crypt is the highlight. Henry I and Matilda lie here in stone sarcophagi, and the space has the weight of somewhere that mattered enormously for centuries. The carved capitals in the nave above are worth a close look too — some of the early 11th-century stonework is surprisingly expressive for its age. Allow at least an hour to see the church, crypt, and the attached palace museum.