Biosphere 2 was amazing because it let us see how those people lived and survived in the close quarters. We had a guided tour that delved into the depths of the environment, from the kitchen and living quarters to the rain forest area to the cooling system. Our guide was very knowledgeable and well-versed on the activities of the inhabitants and the functions of each of the systems. Beware, they are conserving money, so the air conditioner is at a bare minimum, and when you walk through the rain forest, ants crawl up and down your legs. Once you get past the rain forest and you slap or stomp the ants off, everything is fine.
To see and experience how the inhabitants lived and survived in the enclosed environment was well worth the fee that we paid.
For more information and photos, see the Biosphere 2 website at http://www.bio2.com/.