More than two million people have visited Biosphere 2 in Tucson, Arizona to take in one of the modern marvels of science and engineering. Biosphere 2 features a number of habitants that replicate the outside world, including an ocean with coral reef, mangrove wetlands, tropical rainforest, savannah grassland and a fog desert. One of the most popular destinations for visitors to Tucson, the Biosphere 2 draws thousands of visitors each and every year. Come check out the Thermosphere and the energy center and see the latest scientific procedures going on. A guided tour of Biosphere 2 takes about an hour and a 15 minutes. Should you want to explore on your own, you can take advantage of self-guided exhibits and movies, which can add an hour or so to your visit to Biosphere Two. Come see why Time Life named Biosphere 2 one of the 50 must see “Wonders of the World”.