Take cover! This hour of thrills will knock you off your feet. Lose your balance sand-boarding in Oregon, lean into a gravity-defying coaster in Taiwan, and get ready to duck and cover in a half-ton tank at Armourgeddon in England.

The moment you've all been waiting for — the 20 most stupefying attractions on Earth are revealed. We're riding the world's fastest wooden coaster in Illinois, climbing to the tallest waterslide on the planet in Kansas City, and strapping in for tricks, flips and fun in San Diego.