Wartburg Castle in the town of Eisenach, was founded in 1080 as a military camp, the main construction of the Palas, considered to be the best preserved non-religious Romaneseque structure north of the Alps began in 1155. In the 13th century, Saint Elizabeth made the Wartburg her home and Martin Luther translated the New Testament into German here in a period of ten weeks when he was ex-communicated by the Pope. From 1838 to 1890 the castle underwent massive refurbishment and reconstruction and then again in the 1950s. The Elizabeth Bower is particulary beautiful.
You can actually stay in the hotel at the castle, dine in the restaurants or visit the castle tavern in the second courtyard. There are plenty of places to hike and the atmosphere is relaxed and scenery and buildings are beautiful.
http://www.wartburg-eisenach.de/frame_st.htm