Wendy White / Alamy

Biosphere 2Oracle, AZ

2 of 12

Road: I-40

This massive three-acre greenhouse was built as a research
station to simulate the conditions of space colonization. Constructed to be
airtight and self-sustaining, Biosphere 2 was the site of a two-year experiment
with human “Biosphereans,” which went awry in 1991 when oxygen had to be pumped
in, and subjects were sent crucial lifesaving supplies. Now managed by the
University of Arizona and home to ongoing global-warming experiments, the
self-contained mini-world with several climactic zones, including its own ocean
with a coral reef and a rainforest, welcomes visitors.

America's Top Roadside Attractions

Biosphere 2Oracle, AZ

Road: I-40

This massive three-acre greenhouse was built as a research
station to simulate the conditions of space colonization. Constructed to be
airtight and self-sustaining, Biosphere 2 was the site of a two-year experiment
with human “Biosphereans,” which went awry in 1991 when oxygen had to be pumped
in, and subjects were sent crucial lifesaving supplies. Now managed by the
University of Arizona and home to ongoing global-warming experiments, the
self-contained mini-world with several climactic zones, including its own ocean
with a coral reef and a rainforest, welcomes visitors.

Wendy White / Alamy

America's Top Roadside Attractions

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