Schloss Henkell
Just south of Wiesbaden, this 20th-century "castle" is the headquarters of the international wine producer Henkell & Co. There are regular English-language tours of the property (lasting 60, 90, or 120 minutes), which take in both the impressive Rococo marble hall and the seven-story sektkellerei (sparkling wine cellars), followed by tastings of locally-produced bubbly. For a group tour, you'll need a minimum of five people, but there's also the opportunity for self-guided tours with your phone. There are regular events held here, from art exhibitions and classical concerts to wine parties and festivals.
