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Monasterio de Yuso in Spain is home to an ancient library that holds over 300,000 books, including manuscripts dating back to the 9th century. 2. The monastery's hidden gem is a mysterious hidden hallway called the "Passage of the Dead," where monks used to carry the deceased in secret to avoid crossing paths with the living. 3. This historic monastery is famous for producing the first written record of the Spanish language, known as the "Glosas Emilianenses," dating back to the 10th century. 4. One of the quirkiest aspects of the monastery is the presence of a unique clock that has no hands. Instead, it uses bells to indicate the time, with each bell representing a different hour. 5. Legend has it that the founder of the monastery, San Millán de la Cogolla, communicated with birds, even predicting the weather based on their movements. This connection with nature is still honored today through beautiful sculptures of birds found in the monastic grounds.