Human towers for castell building competition in Spain

30 July 2014 Last updated at 06:57 BST

A centuries-old tradition in Spain sees people stack themselves on top of one another, to create incredible human towers, known as castells.
human tower called castells
This group in the town of Valls, near Barcelona, is building a human tower, known in Spain as a castell.
human tower called castells
The castell competition is a Spanish tradition which is believed to date back to the 18th century.
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In a castell event teams compete to create impressive constructions. Each tower needs a lot of helping hands.
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The castell can be up to ten human storeys high and the tower is usually created in three parts. These kids are up seriously high - not for the faint-hearted!
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The base of the tower is made up of a large ring of people stood tightly together. This stabilises the structure and softens the fall just in case any of the castellers lose their balance.
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Once the base is built, the middle level of the tower, known as the tronc, is constructed.
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Small children usually form the top of the tower dome. This part of the structure is called the pom de dalt. Do NOT try this at home!
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This competition was held during the Sant Joan festival in Barcelona, Spain.