In Spain, a group of people run with bulls and hold potato wars in the whole city ... Spain is famous for all kinds of strange group activities. However, the traditional activities of stacking towers are of greatest interest to UNESCO. Stacked towers have a long tradition in Barcelona. People stand on the shoulders of teammates, and the game folds into the tallest tower. People must practice for this important festival in Barcelona for several months. Some people can reach the height of 10 floor and often put their children on the top of the tower.