Members of the Castellers de Vilafranca team that won the 26th 'human towers' festival in Tarragona, Spain, on October 2, 2016. The tradition to build 'human towers', or 'castells', emerged in the 18th century in Catalonia. Castel is considered successful if it was built and 'dismantled' without falls. The highest structure had ten 'floors' with three people in each. In 2010, UNESCO included human towers into the list of the Masterpieces of Oral and Intangible Heritage of Humanity.