Esterházy Castle (Austria)
It has 256 rooms, most of which are occupied by the federal council, but 25 rooms are accessible by tour. The most interesting is Haydn Hall - it is considered the best concert hall in Austria after the Vienna Musikverein. You can also see the palace chapel where the remains of the martyr Constantine, a mummified Roman legionnaire who received the Christian faith, are found.
Camping Oggau, Oggau