Floating in the Dead Sea, the lowest place in the world. The salt content is so high, you can't sink. The salt mist blocks harmful UV so you can't sunburn. The minerals have great healing powers. Very cool.
The Salar de Uyuni (Uyuni Salt Flats) in Bolivia is a 4,000-square-mile pan of salt crust, formed from prehistoric lakes and inhospitably tucked more than two miles above sea level. Dried out, it looks like this: