wartburg
The Wartburg Castle at Eisnach was my favorite castle/palace.
Mostly because I actually learned the history behind it, and there were chairs in every room to sit.
Interesting note:
Martin Luther (christian) and St. Elisabeth (catholic) are both lauded for their achievements at this castle.
(p.s. on May 31st, I watched an opera by Wagner, Tannhauser, that took place at Wartburg Castle!)