I stayed in a nice little hostel in Nürnberg (Nuremburg) called the “Five Reasons”. It was cheap and very nice. It is situated right beside the Nürnberg city wall, a relic going back to the 12th and 16th centuries. About 4 km of the original 5 km wall is still standing. The moat surrounding the wall was never filled with water and is now a nice walking path.