Sightseeing in Uyuni: A Gateway to Surreal Landscapes Uyuni, Bolivia, is a gateway to one of the most surreal landscapes on Earth: the Salar de Uyuni, the world’s largest salt flat. Must-See Attractions: Salar de Uyuni: Experience walking on seemingly endless white plains that mirror the sky. Witness breathtaking sunsets and sunrises reflecting off the salt crystals. Isla Incahuasi: This island within the Salar is home to giant cacti, some over a century old.