The Wartburg is certainly one of the most interesting castles I have ever seen. It showed me how many treasures there were in the former East Germany.
On my first trips to Germany, I was never able to roam freely in the Eastern section--after all, I might be trying to get East Germans out of this "wonderful" Communist country. Just going by train along the specifically allowed routes was an ordeal.
The Wartburg is in Saxony-Anhalt? and it was in Saxony that my grandfather was born.
It is also very much connected to the Protestant Reformer Martin Luther. In 1521 his friends and protectors kidnapped him and carried him off to safety at the Wartburg where he stayed incognito as Junker Jörg. He did not stay here very long, but long enough to translate the New Testament from Greek into German, the first formal translation of any part of the Bible into a popular language. His apartment has been preserved as best as possible.