Alto, Arizona

Salero is a ghost town in the Santa Rita Mountains of Santa Cruz County, Arizona. As one of the best preserved ghost towns remaining in Arizona, Salero is located on private property of the Salero Ranch and is not open to visitors.

The Fred Lawrence Whipple Observatory is an American astronomical observatory owned and operated by the Smithsonian Astrophysical Observatory (SAO); it is their largest field installation outside of their main site in Cambridge, Massachusetts. It is located near Amado, Arizona on the summit, a ridge and at the foot of Mount Hopkins. Research activities include imaging and spectroscopy of extragalactic, stellar, solar system and extra-solar bodies, as well as gamma-ray and cosmic-ray astronomy.

The MMT Observatory (MMTO) is an astronomical observatory on the site of Fred Lawrence Whipple Observatory (IAU observatory code 696). The Whipple observatory complex is located on Mount Hopkins, Arizona, US (55 km south of Tucson) in the Santa Rita Mountains. The observatory is operated by the University of Arizona and the Smithsonian Institution, and has a visitor center in nearby Amado, Arizona. The MMTO is the home of the MMT (formerly Multiple Mirror Telescope), which has a primary mirror 6.5 m in diameter. The name comes from the six smaller mirrors originally used before the single primary mirror was installed in 1998. The primary mirror has a special lightweight honeycomb design made by the University of Arizona's Steward Observatory Mirror Laboratory. The MMT is housed in a building which allows the walls and roof around the telescope to be completely rolled back, allowing it to cool down very quickly in order to improve observation.

The MINiature Exoplanet Radial Velocity Array (MINERVA) is a ground-based robotic dedicated exoplanet observatory. The facility is an array of small-aperture robotic telescopes outfitted for both photometry and high-resolution Doppler spectroscopy located at the U.S. Fred Lawrence Whipple Observatory at Mt. Hopkins, Arizona. The project's principal investigator is the American astronomer Jason Eastman. The telescopes were manufactured by PlaneWave Instruments.

Mount Hopkins is a 8,553-foot (2,607 m) peak of the Santa Rita Mountains range, in Santa Cruz County, southern Arizona. The peak was named after Gilbert Hopkins, who was killed nearby during the Battle of Fort Buchanan in 1865. It is in the Coronado National Forest and is bounded on three sides by the Mount Wrightson Wilderness.

The Infrared Optical Telescope Array (IOTA) was a stellar interferometer array. IOTA began with an agreement in 1988 among five Institutions, the Smithsonian Astrophysical Observatory, Harvard University, the University of Massachusetts Amherst, the University of Wyoming, and MIT/Lincoln Laboratory, to build a two-telescope stellar interferometer for the purpose of making fundamental astrophysical observations, and also as a prototype instrument on which they could perfect techniques which could later lead to the development of a larger, more powerful array. On site construction went on for all 1993 and 1994, with first fringes in December 1993. It is located at Fred Lawrence Whipple Observatory. In 2000 the third telescope came online providing closure phase observations, allowing aperture synthesis imaging to be performed for the first time at IOTA. The array was decommissioned and disassembled in summer 2006 due to lack of funding.

Santa Cruz is a county in southern Arizona, United States. As of the 2020 census, the population is 47,669. The county seat is Nogales. The county was established in 1899. It borders Pima County to the north and west, Cochise County to the east, and the Mexican state of Sonora to the south. Santa Cruz County includes the Nogales, Arizona Micropolitan Statistical Area, which is also included in the Tucson-Nogales, Arizona Combined Statistical Area.

VERITAS (Very Energetic Radiation Imaging Telescope Array System) is a major ground-based gamma-ray observatory with an array of four 12 meter optical reflectors for gamma-ray astronomy in the GeV – TeV photon energy range. VERITAS uses the Imaging Atmospheric Cherenkov Telescope technique to observe gamma rays that cause particle showers in Earth's atmosphere that are known as extensive air showers. The VERITAS array is located at the Fred Lawrence Whipple Observatory, in southern Arizona, United States. The VERITAS reflector design is similar to the earlier Whipple 10-meter gamma-ray telescope, located at the same site, but is larger in size and has a longer focal length for better control of optical aberrations. VERITAS consists of an array of imaging telescopes deployed to view atmospheric Cherenkov showers from multiple locations to give the highest sensitivity in the 100 GeV – 10 TeV band (with sensitivity from 50 GeV to up to 50 TeV). This very high energy observatory, completed in 2007, effectively complements the Large Area Telescope (LAT) of the Fermi Gamma-ray Space Telescope due to its larger collection area as well as coverage in a higher energy band.

Gringo Gulch is a valley in Santa Cruz County, Arizona, in the United States.The valley's name is derived from the ethnonym gringo.

Patagonia Lake is a man-made reservoir in Santa Cruz County, Arizona, United States, located southwest of the town of Patagonia, Arizona and northeast of Nogales. The lake was created by damming Sonoita Creek, and is a popular area for boating and sport fishing. Facilities are maintained by Arizona State Parks as part of Patagonia Lake State Park.

Patagonia Lake State Park is a state park of Arizona, US, containing Patagonia Lake. The 2.5-mile-long (4.0 km), 250-acre (100 ha) lake located near Patagonia, Arizona, is a popular southern Arizona site for fishing, camping, boat rental, picnicking, hiking, and birding. Located inside the park is the recently established Sonoita Creek State Natural Area, Arizona's first major state natural area. Created by the damming of Sonoita Creek, the lake is habitat for reproducing largemouth bass, black crappie, bluegill, green sunfish, flathead catfish, threadfin shad, redear sunfish, channel catfish, and American bullfrogs. Rainbow trout are stocked every three weeks from October to March. Sonoita Creek contains black bullhead, red shiner, mosquitofish, crayfish, American bullfrogs, largemouth bass, Gila topminnows, speckled dace, longfin dace, Sonora suckers, and desert suckers. Special events include an annual mariachi festival in March and bird tours and interpretive programs on request. Patagonia Lake State Park is located on State Route 82, 7 miles (11 km) south of Patagonia, Arizona.

Patagonia is a town in Santa Cruz County, Arizona, United States. As of the 2010 census it had a population of 913. It developed in the mid-19th century as a trading and supply center for nearby mines and ranches. In the 21st century, it is a tourist destination, retirement community, and arts and crafts center.