Coober Pedy, Australia: A combination of climactic conditions and the existence of opal mining in the region have literally driven the residents underground. Everything from residences to churches & hotels are carved out of the ground.
This place called, 'Villa Vals' is situated in Switzerland with stunning alpine surroundings, and is designed by Christian Müller Architects and SeARCH. Another place a hobbit could live in. I woke up channeling lord of the rings apparently