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Members of the Castellers Joves Xiquets de Valls

Members of the Castellers Joves Xiquets de Valls try to complete their human tower during the 25th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 5, 2014. The tradition of building human towers, or "castells," dates back to the 18th century. (Credit: AP / Emilio Morenatti)