The library is noted as being one of two in the world (the Mafra palace library being the other) whose books are protected from insects by the presence of a colony of bats within the library.
Библиотека известна как одна из двух в мире (вторая — библиотека дворца Мафра), чьи книги защищают от насекомых колонии летучих мышей.