Yellowstone National Park's geothermal marvels, including Old Faithful.
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Saddle up for an exhilarating ride across the magnificent rapids of the Grand Canyon.
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Take a hike atop breathtaking glaciers and take in Alaska's ice splendor.
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Visit Hawaii Volcanoes National Park's active volcanoes.
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See rare wildlife while cruising through the Everglades on an airboat.
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Experience rappelling down rock walls and canyoneering in Zion's slot canyons.
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See Denali, the highest peak in North America, and trek into untamed territory.
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Hike through rainforests and alpine peaks in Olympic National Park.
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