In Tarragona, Spain, thousands of people gather to witness one of humanity's strangest and most spectacular contests: building the human towers of Catalonia. Adorned in colorful costume, hundreds of “castellers,” or tower builders, form elaborate human structures that soar into the sky. Containing up to 10 tiers and rising nearly 50 feet high, sometimes, the towers do fall …

This Great Big Story was made in partnership with Toyota Camry ("http://www.toyota.com/espanol/camry/).

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