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Arizona: Biosphere 2

Price: $20 for an adult ticket

Location: Tucson

The Grand Canyon is great, but one of the coolest things to do in Arizona for $20 is visit Biosphere 2. Housing multiple artificial ecosystems, Biosphere 2 conducts state-of-the-art research into topics as diverse as growing food on Mars and the effects of drought on the rainforest.

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The Coolest Thing You Can Do In Each State Of The US With Just 20 Bucks In Your Pocket
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