Where: Oberwesel, Germany
Start of construction: 12th Century
End of construction: 14th Century
Most important renovation: 19th Century
Accessible: yes, exterior and a small museum inside the castle, or as a hotel guest
Important fact:
Destroyed in 1689, but largely rebuilt between 1885 and 1902. Is now in use as a hotel.
 https://www.hotel-schoenburg.com/en/