The Excalibur is a climbing wall at the Klimcentrum Bjoeks, a climbing center in Groningen, The Netherlands. It's the tallest climbing wall in the world, standing at 121 feet with a 36-foot overhang.

Photographer Eric Kieboom took many excellent pictures of this wall, 14 of which are available in his Flickr photostream. He suspended his camera from a kite line for the overhead shots.

Official Site (in Dutch) and Photos via OhGizmo! | Photo: Eric Kieboom