Fürstenberg Castle Ruins, Rheindiebach
- Burgruine Fürstenberg, Rheindiebach
Fürstenberg Castle was built in 1219 by the Archbishop of Cologne to protect his property and toll station. It was destroyed during the Palatine Wars of Succession. Victor Hugo was once impressed by its powerful shielding wall and keep. The former massive curtain wall has recently been restored and the remains of the original rendering have been exposed and are now visible again.