These towers are made out of people, people!

We’ve seen castles made of brick, stone, and sand. But until this week, we’d never heard of castells—which are made of people. You need to see these human pyramids to believe them. And now, thanks to Mike Randolph’s excellent Casteller video, you can.

Filmed in Tarragona, Spain, Casteller captures several teams in close competition to see who can erect the highest, sturdiest tower. The tradition dates back to the 1700s, and the towers themselves can get as high as a six-story building. Incredibly strong, stocky castellers form the bases; very brave, very small children climb up to form the tops. Yes, they sometimes fall, and deaths have been reported. But mishaps are infrequent, and we’re happy to report that no one was hurt in the making of this film.

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These towers are made out of people, people!