Lisbon is home to Biblioteca Nacional de Portugal, the Portuguese national library, which has over 3 million books and manuscripts. The library has some rare books and manuscripts, such as an original Gutenberg Bible and original books by Erasmus, Christophe Platin and Aldus Manutius. Torre do Tombo, the national archive, is one of the most important archives in the world, with over 600 years and one of the oldest active Portuguese institutions. There are, among several others, the Arquivo Histórico Ultramarino and the Arquivo Histórico Militar.