Frank Lloyd Wright School of Architecture, Talieisin West, Scottsdale, Arizona (click here for more info)

Every graduate and undergraduate student at the FLW School of Architecture has the option to build a shelter in the dessert to live in during the school year (no utilities but a few have solar). Today I went on the Desert Shelter Tour at Taliesin to see these shelters. The tour is lead by the students themselves. This two hour hiking in the desert tour turned out to be three hours long. I have to say that after visiting 36 states in 20 months, this tour is by far the coolest thing I have seen or done, and the one experience I've enjoyed the most. It was worth every penny and I would gladly do it again (if my feet ever recover from the trauma!).