Spain human tower competition
Colla Vella Xiquets de Valls form a human tower called "castell", while a supporter applauds, during a biannual competition in Tarragona city, Spain, October 2, 2016 Reuters

Thousands of people competed in Catalonia's human tower competition, Concurs de Castells, that took place in Tarragona, Spain. Around 32 teams, made up of 500 people, built human towers called castells.

The event was watched by approximately 20,000 from around the world. This sport dates back to the 18th century and is listed on Unesco's cultural heritage list.

Scroll down to take a look at human tower competition in Spain:

Spain human tower competition
Castellers de Sants start to form a human tower called "castell" during a biannual competition in Tarragona city, Spain, October 2, 2016 Reuters
Spain human tower competition
Castellers de Sants start to form a human tower called "castell" during a biannual competition in Tarragona city, Spain, October 2, 2016 Reuters
Spain human tower competition
Colla Jove Xiquets de Tarragona start to form a human tower called "castell" during a biannual competition in Tarragona city, Spain, October 2, 2016 Reuters
Spain human tower competition
Castellers de Vilafranca form a human tower called "castell" during a biannual competition in Tarragona city, Spain, October 2, 2016 Reuters
Spain human tower competition
Castellers de Vilafranca form a human tower called "castell" during a biannual competition in Tarragona city, Spain October 2, 2016 Reuters