Privately owned castle where they offer a historic tour and a nice meal at their castle tavern. Don't expect much, as the castle is quite small, but if you are looking for a bit of history and a delicious meal, without the usual tourist crowds, this is a place to go.
Guided tours available in English and German every hour from 11 a.m. to 4 p.m.
Wikipedia (German) https://de.wikipedia.org/wiki/Burg_Klammstein
Official Website http://www.burg-klammstein.at/de/
Coordinates 47°16'31.994" N 13°4'34.643" E