Ruins of castle Nideck and waterfall

The waterfall culminates at 534 meters above sea level, south of the remains of the ruins of the castle Nideck; these are 2 distinct castles (13th-14th century), besieged in 1448 and 1454, then destroyed by fire in 1636. The water of the waterfall flows from a wall of volcanic rock about 25 meters high. There is a legend, that of the giants of the Nideck,