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10 extreme ways to enjoy the outdoors

By: Sidney Stevens on July 15, 2011, 10:50 a.m.
woman looking into a crater impact hole in arizona

Photo: kevinzim/Flickr

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This one's kind of like geocaching. But instead of GPS-toting treasure hunters hiding and locating goodie-filled containers in extreme spots around the world, waymarking involves geographically pinpointing and describing the locations of natural and human-made sites for other high-tech explorers to find and enjoy. "Waymarked" spots cover the planet and include some weird and wacky sights — everything from omnivorous trees, impact craters, and balanced rocks for outdoorsy adventurers to Quonset huts, abandoned toll houses and unusual garage door art for the urbex set.