Adrenaline junkies push their fears to the limit on the world's most extreme attractions. Whether on a roller coaster, zip-line, bungee jump or human catapult, they throw caution to the wind as they experience each new rush.
Thrill seekers in New Zealand base jump from an observation deck and plummet 630 feet without a parachute; adrenaline junkies rappel down an ancient mountain in South Africa; a centrifuge in Florida.
