Palacio de Sal, Bolivia
If you're one of those people who believe you can never have too much salt, then we've got the place for you. The luxurious Salt Palace, located on Bolivia's vast salt flats, is made entirely out of the mineral. From floor to ceiling, including the walls, beds, and chairs, it's all salt, all of the time. And the 16-room property offers dishes like salt-encrusted lamb, of course. Sufferers of high blood pressure should probably look elsewhere for a room.