Ancient underground house in Guryuan, Libya
Casa Mexicana | Reyes Ríos + Larraín Arquitectos.
Masuleh, Iran (a picturesque village where streets are built on the roofs of houses below)
Amazigh house (not sure, to verify) http://it.wikipedia.org/wiki/Amazigh
Villa Valls: Dug Out Of A Mountainside
Cliff dwellings of the Dogon tribe (Sudan), from Bernard Rudofsky's "Architecture Without Architects"
Kandovan The Stone Village