Castellers Colla Vella Xiquets de Valls form a human tower called "castell" during a biannual competition in Tarragona October 5, 2014. The formation of human towers is a tradition in Catalonia. Photo by Reuters.

Castellers Colla Vella Xiquets de Valls form a human tower called "castell" during a biannual competition in Tarragona October 5, 2014.

The formation of human towers is a tradition in Catalonia. 

Photo by Reuters