Buckle your seat belt! We're jumping into the most gut-wrenching, hair-raising thrills the world has to offer. From a vertigo-inducing coaster in St. Louis to roaring lions in Tanzania, the countdown to the No. 1 thrill starts here!

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.