Salt hotel bedroom. The Salt Palace and Spa, on the Uyuni Salt Flats in Bolivia, is made entirely from salt bricks. The bricks are 35 centimetres square, and were cut from the salt flats. Much of the hotel's furniture is also made from salt bricks, including the two beds seen. There are twelve rooms, that surround a courtyard, all of which have flushing toilets but no showers.