The castle of Fuessen by globetrott
Fuessen castle is mainly used by the town's administration nowadays, but you may walk inside that lovely inner-court and admire the interesting facade freely and without restrictions. I don't remember any gates that might be locked at night, so you may easily leave the sight-seeing in this part of Fuessen for the end of the day, when the castles of Neuschwanstein and Hohenschwangau are closed already.
Schloss Fuessen is quite a large area with a few side-courts and some entrance-gates and it would be a pity to miss it, when you come to Fuessen.