The walk or drive up to the hilltop castle of Willibaldsburg (1355) is worth it for the views across the valley from the formally laid-out Bastiongarten ; many locals also head up here on sunny days for the nearby beer garden. The castle itself houses two museums, the most interesting of which is the Jura-Museum, specialising in fossils and containing a locally found archaeopteryx (the oldest-known fossil bird), as well as aquariums with living specimens of the fossilised animals.
