A library in a monastery in Tibet It was discovered in 2003.

It was discovered in 2003, behind a sealed wall, containing 84,000 hand written sutras and scrolls telling the history humanity back 10,000 years. They were written in Sanskrit, Chinese, Tibetan & Mongolian.
The Sakya Monastery boasts an extensive library comprising a staggering 84,000 books arranged on traditional shelves measuring 60 meters in length and 10 meters in height. While predominantly Buddhist scriptures, the collection also encompasses a diverse range of subjects such as literature, history, philosophy, astronomy, mathematics, agriculture, and art. Among these texts, there exists a scripture of unparalleled weight, exceeding 500 kg, making it the heaviest in existence. Additionally, the library houses numerous palm-leaf manuscripts, meticulously preserved thanks to the arid climate of the region.