4 Best Sights in Northwest Tucson and Westside, Tucson

The name "museum" is a bit misleading, since this delightful site is actually a zoo, aquarium, and botanical garden featuring the animals, plants, and even fish of the Sonoran Desert. Hummingbirds, coatis, rattlesnakes, scorpions, bighorn sheep, bobcats, and Mexican wolves all busy themselves in ingeniously designed habitats.

An Earth Sciences Center has an artificial limestone cave to climb through and an excellent mineral display. The coyote and javelina (a wild, piglike mammal with an oddly oversize head) exhibits have "invisible" fencing that separates humans from animals, and at the Raptor Free Flight show (October through April, daily at 10 and 2), you can see the powerful birds soar and dive, untethered, inches above your head.

The restaurants are above average, and the gift shop, which carries books, jewelry, and crafts, is outstanding.

June through August, the museum stays open until 10 pm every Saturday, which provides a great opportunity to see nocturnal critters.

The oldest Catholic church in the United States still serving the community for which it was built, San Xavier was founded in 1692 by Father Eusebio Francisco Kino, who established 22 missions in northern Mexico and Southern Arizona. The current structure was made out of native materials by Franciscan missionaries between 1777 and 1797, and is owned by the Tohono O'odham tribe.

The beauty of the mission, with elements of Spanish, baroque, and Moorish architectural styles, is highlighted by the stark landscape against which it is set, inspiring an early-20th-century poet to dub it the White Dove of the Desert.

Inside, there's a wealth of painted statues, carvings, and frescoes. Paul Schwartzbaum, who helped restore Michelangelo's masterwork in Rome, supervised Tohono O'odham artisans in the restoration of the mission's artwork, completed in 1997; Schwartzbaum has called the mission the Sistine Chapel of the United States.

Across the parking lot from the mission, San Xavier Plaza has a couple of crafts shops selling the handiwork of the Tohono O'odham tribe, including jewelry, pottery, friendship bowls, and woven baskets with man-in-the-maze designs.

In the town of Oracle, about 30 minutes northwest of Tucson, this unique, self-contained cluster of ecosystems opened in 1991 as a facility to test nature technology and human interaction with it. Now managed by the University of Arizona, the biomes include tropical rain forest, savanna, desert, thorn scrub, marsh, and ocean areas. The newest biome, the Landscape Evolutionary Observatory, tracks rainfall in simulated desert environments to study the effects of climate change on water sources and plant life in this region.

Guided walking tours take you inside the biomes, and a brief film gives an overview of Biosphere projects, from the original "human missions"—where scientists literally ate, slept, and breathed their work in a closed system—to current research. A snack bar overlooks the Santa Catalina Mountains.

A 48-acre desert garden retreat designed to promote the conservation of arid regions, Tohono Chul—"desert corner" in the language of the Tohono O'odham—uses demonstration gardens, a greenhouse, and a geology wall to explain this unique desert area. Nature trails, a small art gallery, gift shops (including folk art, prickly pear products, and a great selection of desert plants), and a bistro can all be found at this peaceful spot.

You can visit the restaurant and outstanding gift shops without paying admission.