In Photos: The 27th Human Tower Competition

Tower of strength: a group of castellers in action during a contest at the Tarraco Arena Plaza facilities in Tarragona.

Photograph: Jaume Sellart/EPA

Building blocks: members of the group Colla Joves Xiquets de Valls form a castell.

Photograph: Albert Gea/Reuters

Looking up: Members of the Castellers D’Esparreguera arrive at the 27th Tarragona Competition.

Photograph: Maja Hitij/Getty Images