Where: Trechtingshausen, Germany
Constructed: 12th Century
Most important renovation: 20th Century
Accessible: yes, museum and hotel
Important fact:
Abandoned in the 16th century and blown up
by the French army in 1689.
From a ruinous state rebuilt in neo-gothic style between 1899 and 1902.
https://www.burg-reichenstein.com/en/