Biosphere 2, Arizona USA

An attempt to create a second ecosystem. Inside this building you find an ocean, a rainforest, a desert and a savannah. Four people lived inside the Biosphere 2 for two years without leaving. The 4 people (2 men, 2 women) had to grow their own food. They were supposed to do research but it took so much time to grow their food (and fix with machinery) that there was no time left for research! This I find the most interesting, it is difficult to understand how much time and effort it takes to grow crops and run a farm when you pick your food from the shelves at the grocery store.

Oh and by the way, Biosphere 2 is now for sale.