Biopshere 2, Arizona, USA: A World Within A World
In 1991, eight people entered Biosphere 2. It is 3,15 acre sealed glass facility in Oracle, Arizona. It had been built to mimic the environment of Earth (Biosphere 1) and contained a mini ocean, tropical rainforest, desert, wetland, and grassland.
The idea was to determine, if the crew could thrive for two years in this environment. Also, they must had to grow food and conduct experiments. If it worked, humans would have moved a step closer to figuring out the concept of building colonies in outer space that would be fit for human habitation.
However, it didn’t work. The crew’s body masses began to drop, as well as oxygen levels in the complex. Meanwhile, these “Biospherians” began resenting each other, so after the two years the experiment was written off as a costly failure.
After another aborted attempt in 1994, Biosphere 2 was bought out before being donated to the University of Arizona in 2007. Finally, in 2011, it opened to the public and what proved to be a bad experience for those crews became a genuinely fascinating one for tourists.
On arrival at the 40-acre campus, what greets you is the strangely appealing juxtaposition of the vast and futuristic glass building surrounded by the jaw-dropping mountains of Arizona.This itself is worth the trip, but once you get in, you appreciate the scale of those 1990s experiments.
As you walk around this world within a world and between its hugely differing environments, you can imagine what it must have been like for those crew members. They anticipated a pioneering adventure that led to resentment and failure. Also, on your visit you’re likely to witness first hand the vital work being carried out there today; including research into growing new coral.
At the end of your trip, you may see Biosphere 2 as a gleaming example of a failure that became a success. After all, it is an essential center for present day scientific research as well as a truly fascinating place to visit.
Address:
Biosphere Rd.
Oracle, Arizona, 85739
United States
Coordinates: 32.5798, -110.8507
UnusualPlaces Field Notes
- Location
- Biosphere 2, 32540 S Biosphere Road, Oracle, Arizona, USA
- Coordinates
- 32.57836, -110.84828
- Access
- The public self-guided Biosphere 2 Experience is app-guided and covers indoor and outdoor areas along an approximately one-mile route with about 100 stairs. The operator recommends advance ticket purchase and cannot guarantee walk-in entry. Several biomes are hot and humid; the underground Lung add-on has no elevator and requires stairs.
- Admission
- Current operator prices: $29 adult, $27 senior, and $15 ages 5–17. The operator recommends buying timed tickets in advance; walk-in entry is not guaranteed. Optional guided add-on tours cost extra. Check the live booking page for current availability and rates.
- Time needed
- The University of Arizona estimates about 1 hour 15 minutes for the self-guided, one-mile Experience. Optional guided Lung, Library and History, or nature-walk add-ons require additional time.
- Best season
- The operator does not name a preferred season. The tour combines outdoor walking with tropical indoor biomes that may be hot and humid; check the local forecast and prepare for both environments.
- Opening hours
- The University of Arizona lists tours daily 9:00 a.m.–4:00 p.m.; closed Thanksgiving and Christmas. Timed tickets may sell out, and walk-in entry is not guaranteed, so check availability before travel.
- Location checked
- 2026-10-10
- Facts checked
- 2026-10-22
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