Members of the Castellers of Barcelona join their hands to start making their “castell” or human tower in the Barcelona neighborhood of Gracia, Spain, on May 19, 2013. A “castell” is a human tower traditionally built during festivals in many places in Catalonia. At these festivals, several “colles” or teams compete to build the most impressive towers they can. (Photo by Emilio Morenatti/Associated Press)

Members of the Castellers “Vila de Gracia” form their human tower. (Photo by Emilio Morenatti/Associated Press)

Members of the Castellers of Barcelona crowd together after the collapse of their “castell”. A few participants were slightly wounded after the collapse of the human tower and were taken to a hospital. (Photo by Emilio Morenatti/Associated Press)