This hotel in southwestern Bolivia is constructed entirely from blocks of salt. It was built on the salt desert of Salar de Uyuni. Previously, the only folks in the area were salt miners but apparently it's now a tourist destination. From National Geographic:
The blindingly white flats stretch as far as the eye can see, except for a few raised mounds of salt. Despite its barren appearance, the desert hosts cacti and rare hummingbirds, and three species of flamingos stop over each year to breed.
