Kaiserburg: Tiefer Brunnen (Deep Well) 
Description
With the castle being on the top of a ridge there is no obvious source of water, so they had to dig down, and down, and down, over 50 meters until they finally reached the water table. The guides pour water into the well and it really does feel like ages before it finally hits the bottom.
Charge
Charge for the tour, includes all the other attractions at the castle
Getting There
Latitude: 49.457829; Longitude: 11.076151
What3Words: hero.chin.fells
