Human Towers Are Built In The Tarragona Castells Competition

TARRAGONA, SPAIN - OCTOBER 07: Members of the collas sing the Catalan National Anthem 'Els Segadors' as they display an Independence flag during the 27th Concurs de Castells competition on October 7, 2018 in Tarragona, Spain. The 'Castellers' who build the human towers with precise techniques compete in groups, know as 'colles', at local festivals with aim to build the highest and most complex human tower. The Catalan tradition is believed to have originated from human towers built at the end of the 18th century by dance groups and is part of the Catalan culture. (Photo by David Ramos/Getty Images)