Another ecological treehouse http://www.sandsresorts.com/ hotel is in the natural reserve at Rio Claro , Antioquia, (Colombia).

Desert Cavern Hotel in Coober Pedy, South Australia and the Cuevas Pedro Antonio de Alarcón (named after the author) in Guadix, Spain, as well as several hotels in Cappadocia, Turkey, are notable for being built into natural hole formations, some with rooms underground.