Saguaro National Park Tucson, is home to the nation's largest cacti. The giant saguaro is the universal symbol of the American west. These majestic plants, found only in a small portion of the United States, are protected by Saguaro National Park, to the east and west of the modern city of Tucson. Here you have a chance to see these enormous cacti, silhouetted by the beauty of a magnificent desert sunset. http://www.nps.gov/sagu/index.htm

Biosphere 2 Come tour one of the world's most unique facilities dedicated to the research and understanding of global scientific issues. The Biosphere 2 facility serves as a laboratory for controlled scientific studies, an arena for scientific discovery and discussion, and a far-reaching provider of public education. Its mission is to serve as a center for research, outreach, teaching and life-long learning about Earth, its living systems, and its place in the universe; to catalyze interdisciplinary thinking and understanding about Earth and its future; to be an adaptive tool for Earth education and outreach to industry, government, and the public; and to distil issues related to Earth systems planning and management for use by policymakers, students and the public. Tours daily. http://biosphere2.org/visit/tours

Kit Peak Observatory Kitt Peak National Observatory (KPNO), part of the National Optical Astronomy Observatory (NOAO), supports the most diverse collection of astronomical observatories on Earth for nighttime optical and infrared astronomy and daytime study of the Sun. Sharing the mountaintop site with the National Solar Observatory, KPNO, founded in 1958, operates three major nighttime telescopes and hosts the facilities of consortia which operate 22 optical telescopes and two radio telescopes. (See the Tenant Observatories list.) Kitt Peak is located 56 miles southwest of Tucson, AZ, in the Schuk Toak District on the Tohono O'odham Nation and has a Visitor Center open daily to the public. http://www.noao.edu/kpvc/Prog/

Tucson Botanical Gardens Located on the site of the historic Porter property, Reader’s Digest named Tucson Botanical Gardens as the BEST Secret Garden in America. Among mature trees and expertly cultivated foliage, specialty gardens such as the Cactus & Succulent Garden, Barrio Garden and Herb Garden highlight the diversity of native plants while offering a lush oasis in the heart of Tucson. Tropical butterflies from around the world are featured in the Cox Butterfly & Orchid Pavilion Oct.–May. Experience year-round tours, community events, classes, and art exhibits, as well as the creative, seasonal menu of Café Botanica. https://www.tucsonbotanical.org/visit/

Walking Food Tour On our tour, you will sample food from at least 6 local restaurants. Guides will point out architectural highlights, cultural sites, and great local shops along the way. Visiting tourists & locals agree that our tours are an exciting way to learn about this trendy and vibrant downtown area. http://foodtourstucson.com/

Kartchner Caverns Experience a stunning limestone cave in Southeastern Arizona that boasts world- class features. This “live” cave, discovered in 1974, is host to a wide variety of unique minerals and formations. Water percolates from the surface and calcite formations continue to grow, including stalactites dripping down like icicles and giant stalagmites reaching up from the ground. Tour guides will unveil this fascinating underground landscape during a memorable 1½ hour tour. http://azstateparks.com/Parks/KACA/

Titan Missile Museum "Duck and Cover!" Bomb shelters, the Berlin Wall, weekly tests of the Emergency Broadcast System, the piercing sounds of air raid sirens, and the Space Race. These are the hallmarks of the "Cold War" era. The Missile Museum showcases the dramatic vestiges of the Cold War between the U.S. and former Soviet Union and provides a vivid education about the history of nuclear conflict-a history of keeping the peace. At the Titan Missile Museum, near Tucson, Arizona, visitors journey through time to stand on the front line of the Cold War. This preserved Titan II missile site, officially known as complex 571-7, is all that remains of the 54 Titan II missile sites that were on alert across the United States from 1963 to 1987. Able to launch from its underground silo in just 58 seconds, the Titan II was capable of delivering a 9-megaton nuclear warhead to targets more than 6300 miles (10,000 km) away in about 30 minutes. Nowhere else in the world can visitors get this close to an intercontinental ballistic missile in its operational environment. This one-of-a kind museum gives visitors a rare look at the technology used by the United States to deter nuclear war. What was once one of America's most top secret places is now a National Historic Landmark, fulfilling its new mission of bringing Cold War history to life for millions of visitors from around the world. http://www.titanmissilemuseum.org/