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Photos: Magnificent views of the nighttime heavens in America's 'Dark Sky' parksSkywatchers can see the beauty and vastness of the nighttime skies in these dark sky-designated parks.
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Lassen Volcanic National Park: The West’s Most Beautiful, Least-Visited Wonderland (Photos)The national park is full of steaming vents, snowy trails, diverse wildlife, colorful wildflowers and heavenly night-sky views.
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Dino Graveyard: Photos of Dinosaur National MonumentThe world's richest quarry of dinosaur fossils is located in the American West, at Dinosaur National Monument.
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In Images: Volcanic Monoliths of the American WestArresting features rise above the plains.
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Weird World of Lichen: Anything But OrdinaryLearn about strange, symbiotic organisms.
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Nature's Giants: Photos of the Tallest Trees on EarthGiant sequoias and redwoods are towering sights.
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Photos: Strange & Spectacular Karsts of ChinaStunning peaks create otherworldly atmosphere.
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Saguaros: Living Bouquets of the Sonoran Desert (Photos)These desert giants boast their own bouquets.
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In Images: Mysterious Desert VarnishStrange rock coating isn't fully understood.
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Granite Photos: Bedrock of the EarthSturdy granite makes up mountain peaks and famous natural structures.
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Poinsettia: Flower of the Christmas SeasonThis native of Central America became a symbol of the winter holidays.
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In Photos: Peek Into the World of Prairie DogsThese icons of the American grassland prairie are important for maintain these ecosystems.
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Springtime in the Sonoran DesertColor erupts when spring comes to desert.
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Hell on Earth: Image Tour of Death ValleySee salt flats & wandering rocks.
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Sights and Sounds: Cali's Gurgling Mud VolcanoesEscaping gas creates belching mudpots.
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Florida Everglades: Follow the 'River of Grass' (Photos)Birds, gators and crocs in shallow wetlands.
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Exploring Africa's Cape of Good HopeSee steep cliffs, unique animals and world-famous diving.
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Meteor Crater: Experience an Ancient ImpactPeek into Earth's best-preserved impact crater.
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Photos: Bald Eagles of the Mighty MississippiSee where this American icon spends its winters.
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In Photos: The Wild Cats of Kruger National ParkLions, leopards, cheetahs in South African Park.
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Photos: The Scrumptious Chocolate Falls of ArizonaArizona's Grand Falls are dry most of the time. But during spring runoff, the water runs like chocolate.
