Siebengebirge

Siebengebirge, or 'Seven Mountains,' in Rhenish Prussia, on the right bank of the Rhine, about 20 miles above Cologne. The highest is the Ölberg (1522 feet); but the most famous is the Drachenfels (q.v.). The crags are crowned with ruins of baronial castles of the 12th century. Trachyte is quarried amongst these hills; from them the stone was obtained for the greater part of Cologne Cathedral.