Participants walk maintaining a human tower or “Castellers” during the Saint Merce celebrations in San Jaume square in Barcelona, Spain, Tuesday, September 24, 2019. The tradition of building human towers or “castells” dates back to the 18th century and takes place during festivals in Catalonia, where “colles” or teams compete to build the tallest and most complicated towers. (Photo by Emilio Morenatti/AP Photo)
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