Adrenaline junkies, rejoice! We're counting down the crème de la crème, the pick of the crop, the hands-down best thrills on the face of the planet! Do as the Ancient Romans did, and strap on your best armor for a gladiator fight to the death. Then battle the mighty Goliath roller coaster in Gurney, Illinois. Finally, test your limits on Kansas City's Verrückt, the world's tallest water slide.