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09.05.2026 New claim submitted for Mental Calculation, Division 09.05.2026 New claim submitted for Mental Calculation, Square Roots 23.01.2026 New claim submitted for Pull-ups, 3 Minutes, Male Keywords: (e.g football beer mat)	Listed below are the verified claims for the record listed. Largest Cardboard Play Structure - Current world record 1. A record breaking cardboard castle has been constructed on 18 August 2007 on the parking lot in front of the Eastern Washington University in Cheney (Washington,USA). The castle, measuring 34.05 m [111 ft 9 in] x 22.05 m [72 ft 4 in], has been made from corrugated cardboard. All the material has been donated by Cheney's Allpak Containers and was recycled afterward.     The Book of Alternative records - World records, record breakers and more!