The Büraburg on the Büraberg above Fritzlar - Ungedanken. The largest imperial castle of the Franks and the only Hessian bishop's seat in Carolingian times.
Büraberg is the most historically significant mountain in northern Hesse. The mountain plateau dominated the lower Eder valley. Its flanks drop steeply on three sides. The mountain is thus protected by nature against attacks to a large extent. With an area of more than 12 hectares, the plateau, now secured by ramparts and ditches on the only accessible side in the west, reaches the dimensions of the town of Fritzlar in its medieval heyday - but the Franconian Büraburg is centuries older!