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New Study Describes How Earth's Surface MovesStudy explains western North America's present-day landscape.
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Gallery: Most Famous Waterfalls in the USGaze at these amazing waterfalls, from tourist attractions to cult favorites.
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Crazy Photo: Lightning & Double Rainbow Over BadlandsRare site over world-famous fossil bed.
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Ahoy! St. Marks Lighthouse Beckons Migrating BirdsSecond-oldest lighthouse in Florida still operates today.
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7 Beautiful Bike RidesStrap on a helmet and pedal through some of the most beautiful terrain in America.
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Dreamy Image: Mount Rainier Glows at SunriseEnjoy this beautiful sunrise photo.
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Steamy Image: Augustine Volcano Blows SmokeAlaska Volcano Observatory celebrates 25 years in action.
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Hoot of an Image: Owl Nests in Giant CactusGiant cacti are perfect for nesting owls.
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Impossible Image: Gravity-Defying Bighorn SheepLike something out of a Spider-Man movie, this goat goes vertical.
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Image: Bison Roam At Yellowstone's Dragon's MouthThe warm spring keeps away the snow so bison can feed.
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Sure Sign of Spring: Snow Melts at Great Sand DunesSpring is the perfect season for sandboarding.
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Awe-Inspiring Photo: Death Valley Goes DarkFamously-hot park named as dark sky destination.
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Wilderness 'Paparazzi' Flock to Yosemite's 'Firefall'No 'firedrizzle' this year, Horsetail Fall is glowing like lava.
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Land of Giants: Sequoia and Kings Canyon National ParksHome to soaring mountains and the world's biggest trees.
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Gorgeous Photo: Yosemite Sparkles in WinterFind solitude deep in the winter wilderness on a backcountry ski trip.
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Photo: Northern Lights Dance Over DenaliLight show dazzled Alaskans this past weekend.
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Gorgeous Photo: Florida's National Key Deer RefugeRefuge has helped deer population in Florida Keys to stage a comeback.
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Science on Thin Ice: Polar Missions Sample Extreme LifeFinding microbes that can withstand the coldest temperatures on Earth.
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Dizzying View: Astounding Arches of Moab, UtahFrom the dizzying to the head-scratching, Arches National Park is home to some of the most amazing natural structures on Earth.
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Un-bear-ably Cute: Black Bear Caught NappingHikers aren't the only ones in need of a break.
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Photo: Frost Flowers in Bloom on Arctic Sea IceFrost flowers could hold secrets about possible extraterrestrial life.
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... And A Cardinal in A Snowy TreeThis Christmas red bird takes a breather in one of the most important bird habitats in North America.
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Stunning Image: Hidden Groves of the Florida KeysArt exhibit on Florida Keys now on display at Biscayne National Park.
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Photo: Eastern Screech Owl Haunts The NightWhile most people never notice them, their trembling calls are commonly heard at night.
