On this afternoon tour we explore the extraordinary, nature- sculpted scenery of Moon Valley, made up of sand, clay, salt and gypsum and located 13km from San Pedro in the Cordillera de la Sal.  In this most arid of landscapes are features such as rock-salt caves, huge formations like the Three MarĂ­as and giant sand dunes; a perfect scenario for contemplating the colourful and magical spectacle of the desert sunset.