Come experience The University of Arizona’s Biosphere 2 and find out why Time Life Books called it “one of the 50 must-see wonders of the world.” Guided tours take you inside the world’s largest living science center dedicated to exploring the environment, the future, and our planet. This offer provides 4 tickets to Biosphere 2. No reservations required, open daily except Thanksgiving and Christmas Day. Expires on 11/30/2026.