Mount Everest is 8848 meter [29029 ft] in height and its summit has been scaled by over 4,000 people, while Mount Kailash is 6638 meter [21778 ft] and its summit is unclimbed.
Jainism, Hinduism, Buddhism, and Bon are the 4 major religions that believe Mount Kailash to be a sacred place. It is said that Mount Kailash is the heavenly abode of Gods and that's the reason why no mortal has ever been able to climb it.
According to ancient Tibetan legends and writings, 'No mortal ever be allowed to walk atop Mount Kailash, where among the clouds, is the abode of the gods. He who dares to start the top of Mount holy and see the faces of the gods will be put to death!'
Mount Kailash in Tibet has never been climbed by any mountaineer. It is heard in stories that a mystic Tibetan seer and poet named Milarepa is the only human being who has been abel to climb the peak of Mount Kailash. It was over about some 900 years ago, and since then we have just heard the stories of how nobody has been able to reaching the summit of this unclimbable peak.
The Hindus, Buddhists, jains & Bons all consider that Mt. Kailash is a very Holy & Sacred Mountain. No one wanted to hurt the sentiments of these 4 religions with huge followers, hence no one ever conquered th HOly Mount Kailash. more over enthusiast mountain climbers have many more tough and challenging Mountain peaks other than Mt. Kailash.