3. Upper Mustang: The Upper Mustang trek brings you into the hidden world of the old Buddhist kingdom of Mustang, also called Lo which used to be part of the Tibetan empire, and is therefore closely related to Tibet. Not only the culture, but also the landscape is very much related to Tibet. Mustang lies in the rain shadow of the Dhaulagiri and you walk in a complete desolate landscape, surrounded by rocks in all kind of colors and bizarre formations. In this barren landscape the villages with their bright colored fields are like oases. The culture of the people living there is one of the major attractions for tourists and visitors alike.