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10 parks for the serious rock climber

Sandstone cliffs at Zion National Park

Photo: Dan Mahr/Flickr

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Zion National Park

For fans of big wall climbs, Zion National Park's vast 2,000 foot high sandstone cliffs offer an extreme but fun experience. The park also offers top roping, sport climbing and bouldering. Beware of the unshaded walls that can bake in the 100 degree heat of summer; the best time to climb is between March and May, and between September until early November.