Hotel Russia

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 cave formations, some with rooms underground. The Desert Cave Hotel in Coober Pedy, South Australia is built into the remains of an opal mine.
Capsule hotels
Capsule hotels are a type of economical hotel that are found in Japan, where people sleep in stacks of rectangular containers.