Key Monastery, Lahaul and Spiti District - TripadvisorKey Monastery is the largest Tibetan Buddhist monastery in the Spiti Valley, Himachal Pradesh, located on a hilltop at about 13,668 feet. It serves as a major center for religious training, is over 1,000 years old, and is known for its ancient murals, rare manuscripts, and collection of weapons. The monastery has a long history marked by multiple destructions and reconstructions, and it notably hosted the Kalachakra ceremony in 2000 with the