The Enfer (; French: [ɑ̃fɛʁ], literally, Inferno or Hell) is a special department of the Bibliothèque nationale de France in Paris. It is a special collection of books and manuscripts of an erotic or pornographic character which, because of their rarity and value, may be seen only with authorization. The Enfer was established 1836–1844 and is one of the most famous private case collections. In 2013, the Enfer contained about 2,600 volumes, dating from the 16th century to the present. Source: Wikipedia (en)