Idstein Castle - Credit: Wikimedia Commons
Idstein Castle (), later the Renaissance style Schloss Idstein, is located in Idstein in the county of Rheingau-Taunus, Germany. The hill castle was the residenz of the counts of Nassau-Idstein. The castle's Witches' Tower (Hexenturm) is one of the town's oldest buildings and a substantial local landmark. Read more on Wikipedia
Source: en.wikipedia.org