Polsar Holding B.V., Bieskemaar, Groningen, Nederland

For the Dutch, apparently, it’s mountains to climb. Evidence of this: Excalibur Tower, the world’s largest freestanding climbing wall.

Thrusting up from the otherwise flat landscape surrounding the Dutch city of Groningen, the tower tops out at 121 feet, with a long slab climbing on one side and a 36-foot overhang on the other.

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