Biosphere 2 was listed on the Top 50 places to see in the US. We live in Tucson so we decided to visit today. While it is somewhat interesting, during the tour they really couldn't site any breakthrough research that occurred at the facility. The research that was underway appeared to be in its' infancy.
The facility also needs some significant maintenance. There are some places in the glass structure where the molding/caulking between the windows isn't there leaving an open space. Some of the metal in the structure is severely rusted. The downstairs ocean viewing area felt really dingy and dated.
With the AAA discount, this was $18/person. It was just okay. I wouldn't go out of my way to visit.
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