Members of the "Castellers de Villafranca" try to complete their human tower during the 27th Human Tower Competition in Tarragona, Spain, Sunday, Oct. 7, 2018. (AP Photo/Emilio Morenatti)

Members of "Castellers de Sants" fall as they try to complete their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. 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. "Castells" were declared by UNESCO one of the Masterpieces of the Oral and Intangible Heritage of Humanity. (AP Photo/Emilio Morenatti)

Members of "Colla Vella del Xiquets de Valls" celebrate after completing their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. 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. "Castells" were declared by UNESCO one of the Masterpieces of the Oral and Intangible Heritage of Humanity. (AP Photo/Emilio Morenatti)

Members of the "Colla Vella dels Xiquests de Valls" try to complete their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. (AP Photo/Emilio Morenatti)

Members of "Castellers de Sants" complete their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. 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. (AP Photo/Emilio Morenatti)

Members of the "Colla Vella dels Xiquests de Valls" try to complete their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. 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. "Castells" were declared by UNESCO one of the Masterpieces of the Oral and Intangible Heritage of Humanity. (AP Photo/Emilio Morenatti)

Members of the "Colla Vella dels Xiquests de Valls" celebrate after completing their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. 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. "Castells" were declared by UNESCO one of the Masterpieces of the Oral and Intangible Heritage of Humanity. (AP Photo/Emilio Morenatti)

In this Saturday, Oct. 6, 2018 photo, a participant reacts as members of the "Castellers de Terrassa" try to complete their human tower, during the 27th Human Tower Competition in Tarragona, Spain. 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. "Castells" were declared by UNESCO one of the Masterpieces of the Oral and Intangible Heritage of Humanity. (AP Photo/Emilio Morenatti)

A member of "Castellers de Sants" waits for medical assistance after being injured during their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. 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. (AP Photo/Emilio Morenatti)

Members of the "Colla Joves Xiquets de Valls" try to complete their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. 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. (AP Photo/Emilio Morenatti)

Members of the "Colla Joves Xiquets de Valls" complete their human tower during the 27th Human Tower Competition in Tarragona, Spain, on Sunday, Oct. 7, 2018. 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. "Castells" were declared by UNESCO one of the Masterpieces of the Oral and Intangible Heritage of Humanity. (AP Photo/Emilio Morenatti)

In this Saturday, Oct. 6, 2018 photo, a participant reacts as members of the "Nens de Vendrell" try to complete their human tower, during the 27th Human Tower Competition in Tarragona, Spain. 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. "Castells" were declared by UNESCO one of the Masterpieces of the Oral and Intangible Heritage of Humanity. (AP Photo/Emilio Morenatti)