Nosebleed: Watch the World's Tallest Human Towers Tumble to the Ground

Pom-pom pyramids? Kids' stuff! When it comes to building sky-high human towers, who could ever match the skill and heroism of the castellers—or castle builders—of Catalonia, Spain? Nadie! Nobody! These colorful climbers have only one rival: They know it as la gravidad. You know it as gravity. Watch them contend with it in the video clip below.