Once every two years the city of Tarragona, in Catalonia, Spain, hosts one of the most stunning human tower competition in the world: the "Concurs de Castells". The team of "Colla Vella Xiquets de Valls" was the winner of last 2018 edition after completing successfuly some of the highest and most difficult human structures ever seen. Human Towers, known in Catalan as "castells", have been one of the most important cultural traditions in the region of Catalonia for more than 200 years and have become part of the identity of Catalan people.