Rheinstein Castle (Germany)

In the 1820s, privately owned Rheinstein, 6km downstream from Bingen, became the first castle on the Rhine to be converted - by the Prussian royalty (a branch of the Hohenzollern) - into a romantic summer residence complete with turrets and battlements. Today the neo-Gothic interior is furnished more or less as it was more than a century ago. Highlights include a tiny chapel, the Rittersaal (Hall of the Knights), and stained glass windows from the 14th to 19th centuries brought from the churches of Cologne and Düsseldorf.