Think it's all been done before? Think again. Adventure magazine names the last unexplored places on Earth and beyond.
The Longest Slope: The descent, not the climb, beckons adventurers to Mount Saint Elias on the Alaska-Canada border. The 18,008-foot peak is believed to offer the longest skiable vertical in the world. In 2002 two skiers were killed attempting to make the first descent.
The Deepest Cave: Mexico's Sistema Cheve, in the running for deepest cave system in the world, may hold the key to breaking spelunking’s elusive 2,000-meter barrier. The system’s estimated depth is 8,337 feet and dye testing suggests the existence of a path through the deadly labyrinth.
The Biggest Wave: In 2002 11 world-class surfers signed on to the Billabong Odyssey, a quarter-million-dollar contest to find and ride an elusive hundred-foot wave. The search is on through 2004.
The Next Planet: Even before the Columbia disaster, NASA was reluctant to commit to a timetable for putting humans on Mars. But most experts expect the effort to take at least two decades. One hurdle: the psychological risks of cooping up a small crew for the three-year round trip.
