Burg Rheinstein
North of Bingen on the road from Bacharach, this impressive castle was the home of Rudolf von Hapsburg from 1282 to 1286. To establish law and order on the Rhine, he destroyed the neighboring castles of Burg Reichenstein and Burg Sooneck and hanged their notorious robber barons from the oak trees around the Clemens Church, a late-Romanesque basilica near Trechtingshausen. The Gobelin tapestries, 15th-century stained glass, wall and ceiling frescoes, a floor of royal apartments, and antique furniture—including a rare "giraffe spinet," a harpsicord which Kaiser Wilhelm I is said to have played—are the highlights of a visit here. All of this is illuminated by candlelight on some summer Fridays. Rheinstein was the first of many Rhine ruins to be rebuilt by a royal Prussian family in the 19th century. If coming by car or boat, leave your transport at river level and prepare for a 10-minute climb up. By train, it's a 30-minute walk from Trechtingshausen station.