Shambala 
"In the mythology of Tibetan Buddhism,
Mount Meru is a place which simultaneously represents the center of the universe and the single-pointedness of mind sought by adepts. Thousands of miles in height, Meru is located somewhere beyond the physical plane of reality, in a realm of perfection and transcendence. Symbolic representations of Mount Meru are commonly found in Tibetan mandalas, contemplative diagrams designed to aid meditators in focusing.
It is said that Meru has its roots in hell, and its summit in heaven. Meru is surrounded by seven rings of golden mountains, each separated from the other by one of seven circular oceans. It is crowned by a golden palace wherein Indra, king of Hindu gods, resides. This entire superstructure rises from an outer ocean, and is flanked by four main continents, each with two subcontinents.
The southern continent, Jambudvipa, corresponds to the physical earth. Each of the other continents represents a nearby planet upon which transmigrating souls following the yellow light-path may be reborn. However, it is said that all of these worlds are undesirable, for they are non-human worlds inhabited by sheep, cattle, or horses. The teachings of Buddhism clearly state that existence as a human being is the only way to achieve Buddhahood, so rebirth in any other form (including that of a deva or demigod) is a distraction from the path to enlightenment.
According to legend, somewhere in the northwest region of Jambudvipa lies a land called Shambhala. This is a magical land which is shaped like an eight-petalled lotus flower. It has been ruled by priest-kings for many thousands of years; in fact, the legend of Shambhala predates the introduction of Buddhism into Tibet. In the aboriginal Bon religion, Shambhala is known as Olmolungrung, and is based on the square instead of the circle.
Shambhala forms a gateway between the physical and spiritual realms. It is endowed with riches, and is ideally suited for the habitat of enlightened souls. They are not attached to the fruits of karma, and are but one step from Buddhahood. This is the realm to be sought for rebirth if one desires the swiftest path to nirvana."
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Source of QuoteAre there ufos seen in that region? Lots of tourists. Mountain climbers, ballooners...
I would imagine satellite infrared images of that area would show anomalies at night. Any energy leaking to the surface through a large cave opening might be detected. If someone is capable of displacing soil and rock, that would be detectable.
So, either the caves are pre-existing (and likely known), or constructed of displaced soil and rock. Overhead satellites would get an eyeful. But, I am open to interesting sightings!