Participants built a human tower during the 27th human tower competition in Tarragona,Spain on Saturday. The tradition, locally known as Castells, dates back to the 18th century and takes place during festivals in Catalonia.Thousands of people participated in the event which tested their strength, balance and team spirit, and created structures between six and ten tiers tall. (Photos: IC)

Participants built a human tower during the 27th human tower competition in Tarragona,Spain on Saturday. The tradition, locally known as Castells, dates back to the 18th century and takes place during festivals in Catalonia.Thousands of people participated in the event which tested their strength, balance and team spirit, and created structures between six and ten tiers tall.

Participants built a human tower during the 27th human tower competition in Tarragona,Spain on Saturday. The tradition, locally known as Castells, dates back to the 18th century and takes place during festivals in Catalonia.Thousands of people participated in the event which tested their strength, balance and team spirit, and created structures between six and ten tiers tall.

Participants built a human tower during the 27th human tower competition in Tarragona,Spain on Saturday. The tradition, locally known as Castells, dates back to the 18th century and takes place during festivals in Catalonia.Thousands of people participated in the event which tested their strength, balance and team spirit, and created structures between six and ten tiers tall.