Palacio de Sal (Spanish for “Palace of salt”) is a hotel built of salt blocks located at the edge of Salar de Uyuni, the world’s largest salt flat, 350 km in Bolivia. With an area of 12,000 sq km, a height of 3660 meters above sea level, a thickness of 120 meters and with 11 strata from two to twenty, the Salar de Uyuni is the largest salt mirror in the world which is seen from space. The hotel was constructed using about 1 million 35-cm (14-inch) salt blocks, for the floor, walls, ceiling and furniture, including beds, tables, chairs and sculptures. The hotel has a dry sauna and a steam room, a saltwater pool and whirlpool baths. In the hotel, there is a rule prohibiting licking the walls (in order to prevent their degradation).