The construction of human towers known as "castells" was celebrated at the 25th annual Castells Competition in Tarragona in the Catalonia region of Spain.

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Castellers Colla Vella Xiquets de Valls form a human tower called "castell" during a biannual competition in Tarragona, Spain. The formation of human towers is a tradition in the area of CataloniaReuters

The "Castellers", who build the human towers compete in teams known as "colles", aim to build the highest and most complex tower. The tradition dates back to the end of the 18th century and is an important part of Catalan culture.

IBTimesUK presents a gallery of spectacular photos taken at the Tarragona Castells Competition, held in the Tárraco Plaza bullring.

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Castellers Colla Joves Xiquets de Valls start to form a human tower called a "castell" during a biannual competition in Tarragona, Spain. The formation of human towers is a tradition in the region of CataloniaReuters
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Castellers Colla Joves Xiquets de Valls start to form their human towerReuters
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Castellers Colla Vella Xiquets de Valls form a human towerReuters
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Members of Castellers Colla Vella Xiquets de Valls fall after forming a human towerReuters
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Members of the Colla Castellers de Vilafranca start the construction of a human tower during the 25th Tarragona Castells CompetitionGetty
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The helmet worn by a young member of the Castellers de VilafrancaAFP
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Castellers de Vilafranca form a human tower, called a "castell", during a competition in a stadium in Tarragona, Catalonia, SpainReuters
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Castellers de Vilafranca celebrate after forming their human towerReuters
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Castellers de Vilafranca fall after forming a human towerReuters
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Members of the Castellers de Vilafranca team lie on fellow team members after their tower collapsedAFP
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Medical staff carry a member of Castellers de Vilafranca who fell while forming a human tower in TarragonaReuters
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A girl climbs down as Castellers Colla Jove Xiquets de Tarragona form a human towerReuters
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Members of the Colla Jove Xiquets de Tarragona form a human towerGetty
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Members of the Colla Jove Xiquets de Tarragona celebrate after the construction of a human towerGetty
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Castellers de Sants form a human towerReuters
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Members of the Castellers de Sants human tower team fall after forming a castellAFP
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Members of the Castellers de Villafranca team unfurl a huge flag to celebrate winning the 25th human towers, or castells, competition in TarragonaAFP