Every alternate year in October, teams from across Spain assemble in Tarragona, a city to the southwest of Barcelona, and compete to build the tallest tower of people, also known as castells. Photo: AP
40 teams reportedly competed, but only one came out victorious.
It has been reported that when the tower is built, the person at the top is required to extend four fingers on one hand to symbolize the Catalan flag.
Associated Press photojournalist Emilio Morenatti explained, "The structure of the castells varies depending on their complexity. A castell is considered completely successful when it is loaded and unloaded without falling apart."
Several photographers from around the world traveled to view the eccentric athletes as they climbed their way to the top.
On Sunday, teams adorned in unique, brightly colored team attire, to compete in the competition.
The tower is only considered successful if no one falls during its creation.
Traditionally known as "castells," these human formations have been built since the 18th century by Catalan acrobats.
Almost 75 to 100 men, women and children comprise each team, and get five chances to construct a tower.
The Human Tower Competition celebrated its 25th anniversary on Sunday, as a number of amazing towers were erected and quickly fell apart.
Humans tower over Spain to create tallest standing formation