The Tarragona Castells may be the most fascinating team sporting event in the world.

Members of the Castellers Collas Jove Xiquets de Tarragona fall as they tried to complete their human tower during the 25th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 5, 2014. Emilio Morenatti/AP

Members of the Castellers de Villafranca celebrate after finishing their human tower during the 25th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 5, 2014. Emilio Morenatti/AP

Members of the Castellers de la Vella celebrate after finishing their human tower during the 25th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 5, 2014. Emilio Morenatti/AP

In this Saturday, Oct. 4, 2014 photo, members of the Castellers de Osona complete their human tower during the 25th Human Tower Competition in Tarragona, Spain. Emilio Morenatti/AP

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. Emilio Morenatti/AP

In this Saturday, Oct. 4, 2014 photo, members of the Castellers de Terrasa watch as others castellers complete their human tower during the 25th Human Tower Competition in Tarragona, Spain. Emilio Morenatti/AP

Members of the 'Colla Jove Xiquets de Tarragona' fall down during the construction of a human tower during the 25th Tarragona Castells Competition on October 5, 2014 JOSEP LAGO/Getty Images

Members of the 'Colla Jove Xiquets de Tarragona' during the construction of a human tower during the 25th Tarragona Castells Competition on October 5, 2014 in Tarragona, Spain. Alex Caparros/Getty Images

Members of the Castellers de Villafranca react as they watch their teammates forming a human tower during the 25th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 5, 2014. Emilio Morenatti/AP

A member of the Colla 'Castellers de Sabadell' prepares before the 25th Tarragona Castells Competition on October 5, 2014 in Tarragona, Spain. Alex Caparros/Getty Images

In this Saturday, Oct. 4, 2014 photo, a wounded woman of the Castellers de Osona is held by teammates after falling while forming their human tower during the 25th Human Tower Competition in Tarragona, Spain. Emilio Morenatti/AP