I'd like to show you Schloss Bürresheim in Rhineland-Palatine (Germany), near Rhine and Moselle and deep in the hills of the Eiffel. (to Koblenz ~100 km, Maria-Laach ~20 km)
This castle was started in 1157 and it was never destroy. The interior is 100% original and the last owners left the castle 1948. This alone makes it a very unique castle.
But! You can see ruins aswell. The castle was owned by to parties (Trier+Cologne) and the Cologne guys just didn't invest a single coin. The Trier people didn't invest, because the Colognians were the enemy. So colognes part collapsed.
For infos in german click here
For those, who may not understand one word:
I visited the castle last saturday and I enjoyed the trip very much. You knwo it does not allways have to be Burg Eltz. Bürresheim is smaller, but it is not that crowded and you can easily spend a couple of hours there.