"Castells" refers to the traditional Catalan human towers that are built during festivals in Catalonia, Spain. These impressive structures are created by groups of people, known as "collas," who work together to climb on each other's shoulders. The goal is to form a tall tower, often reaching several stories high, showcasing teamwork, balance, and strength. The practice of building castells dates back to the 18th century and has become a symbol of Catalan culture. In 2010, castells were recognized by UNESCO as an Intangible Cultural Heritage of Humanity, highlighting their significance in promoting community spirit and cultural identity.