This is a little hidden gem. After you have gone a seen the two Ruine Fragenstein come back down but continue to this tunnel. It takes you under the Ruine …
The Schlossbachklamm was closed for a while due to rockfall, but is now open again. To be on the safe side, call TVB Seefeld beforehand to make sure it is not closed.
A week before our tour, a lot of the shore area was destroyed by a storm/flood. The access road was partially washed away and the power supply in the valley had failed...