The 37m high tower with an 11m overhang on one side is reckoned to be the tallest free standing climbing wall in the world with its 50 ton upper body held (just about) vertical by a 500 ton foundation. The owners claim that it can withstand Beaufort 12 winds, although they don't specify if it is still open for climbing in those tricky conditions. The Excalibur as it is known is run by the Climbing Centre Bjoeks in Groningen, Netherlands and whilst the tower is designed for experienced climbers they do run courses for less experienced climbers. Team building exercise springs to mind?
A very big peak in a flat country Jagged Horizons
It is somewhat ironic that this cloud-busting climbing wall should appear in one of the flatter parts of Europe.