Donaustauf is a market town in Bavaria, 5 km (3 mi) east of Regensburg at the foothills of the Bavarian Forest. The ruins of a medieval castle, presumably erected between 914 and 930, tower above the small town. Situated nearby on a hill rising from the Danube is the imposing Teutonic temple of fame, Walhalla, a costly reproduction of the Parthenon in Athens which was commissioned by Bavarian King Ludwig I and inaugurated on 18 October 1842.