Some travelers live on the edge. Never satisfied with lazing away their vacation days on the beach, these thrill seekers look for adventure on their days off. If orbiting the Earth, diving in shark-infested waters, or getting up-close-and-personal with a gorilla sounds like your idea of a good time, you're in luck. We've found 10 extreme travel adventures to get your heart racing and, just in case you aren't quite ready to light yourself on fire in a movie-quality stunt, we've also included a similar – albeit less-adrenaline-pulsing – alternative with each of our top adventure-filled trips.

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