Castells are human towers built during festivals in Catalonia, Spain. These impressive structures are created by groups called collas, who work together to climb on each other's shoulders. The goal is to build a tower as high as possible, often reaching several stories tall. The tradition of building castells dates back to the 18th century and is recognized as a UNESCO Intangible Cultural Heritage. Each tower is carefully constructed, with a focus on teamwork, balance, and strength. The final person to climb to the top is called the anxaneta, often a child, symbolizing hope and the future.