Photographer Noah Sheldon took a series of photos of Biosphere 2 in Arizona. BLDGBLOG has more info.
The largest sealed environment ever created, constructed at a cost of $200 million, and now falling somewhere between David Gissen's idea of subnature — wherein the slow power of vegetative life is unleashed "as a transgressive animated force against buildings" — and a bioclimatically inspired Dubai, Biosphere 2 even included its own one million-gallon artificial sea.