The trek to Himalayan (old desert attached to Tibetan boarder is a fantastic journey leading you to sacred semi-independent kingdom of Nepal. Also locally known as Lo the upper mustang area is bestowed with ancient Buddhist monasteries, hundreds of secret caves, and spectacular semi-arid landscapes. Restricted for individual trekkers and back packers even these days you need to obtain special permit form department of immigration and have to be organized by a trekking agency licensed by Nepal government. Hiring a professional trekking guide is a must. Upper mustang is popular for witnessing unspoiled culture, exploration of mystic caves and century’s old monasteries. The trek to the last forbidden kingdom resembles the journey in highlands of china and Tibet.