Saguaro National Park

Explore the great outdoors at Catalina Mountain State Park, a museum that is 85% outside, and Biosphere 2, an enormous glass terrarium.

Geoffrey Campbell, assistant general manager of Hacienda del Sol Guest Ranch Resort in Tucson, Ariz., shares insider tips on what to do and see in Tucson.

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These saguaro cactuses only grow in the Sonoran Desert.