Yellowstone National Park's Old Faithful erupting a column of steam and superhot water.
(Image credit: dreamstime)
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The Beauty of Nature's Grand StaircaseThe Grand Staircase Escalante-National Monument in southern Utah is named for the spectacular Grand Staircase of cliffs and terraces.
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Top 10 Most Visited National ParksThe national park bucket list.
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How Yellowstone Recovers from Forest Fires -
Man's 7,000-Mile Wild America Trek Nears EndPreservationist has biked, paddled and walked far more than 500 miles.
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Our Daily Planet: Deadly Tornadoes and London Marathon WeatherToday's Earth news headlines and links.
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Mammoth Caves: Largest Cave System on EarthCaves carved by water over eons.
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Grand Canyon: Take a Hike Through Geological TimeJourney down through canyon's layers.
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Amur Tiger Survival Looks BleakEffective population down to 14 animals.
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Suicides in National Parks (Infographic)Table of data showing suicide data for US National Parks
