Spectators watched on at the 30th Concurs de Castells (castles) - the world's largest competitive human tower event as members of the Castellers de Barcelona team formed a 'castell' in Tarragona on Sunday.⁣ ⁣ The 'Castells' human towers tradition - originally made during festivals in Catalonia - brings together teams attempting to build and dismantle the tallest human tower. ⁣ ⁣ #HumanTower #Tarragona #Spain