The academic prison consists of three small rooms in which students were imprisoned in violation of the laws of the university, such as not returning a book to the library. This former prison is located in the basement of the Guanina Library at the University of Coimbra. In 1834, after the liberal revolution in Portugal, it was used as a deposit of illuminated books and manuscripts Of churches and monasteries, but today, it is open for a visit as a historical museum.