Biosphere 2 is a world-famous research facility operated by the University of Arizona, located near Oracle in eastern Pinal County. The Biosphere 2 Experience now allows visitors to tour the interior of the facility. This fascinating, family-friendly experience is guided by a tour app and takes about 1 hour and 15 minutes to complete. Please download the free app prior to arrival and visit the website to learn about the reopening of the Biosphere 2 interior to visitors.