— “tours in a human experiment: biosphere 2, 32540 s. biosphere road, oracle, AZ directions: from tucson, take oracle road (highway 77) for about 30 miles and turn right at the sign. hours: 9 a.m.-4 p.m. daily”

http://www.fresnobee.com/2014/04/03/3857904/exploring-biosphere-2.html