Bibliothèque Nationale: It was not before the 1860's that the architect Labrouste was to radically transform the premises; he built the entryway facade on Louvois Square, the great reading hall and the central reserve section, originally illuminate by great stained-glass windows. The new buildings are supported by an innovative system of metallic carpentry. The 12 million books, the periodicals, the sound library and the audiovisual are all being moved to the Tolbiac location in the 13th district. The traditional National Library will keep the specialized collections, the manuscripts, the engravings, the ancient maps, the musical scores, the photographs, the theatrical costumes, the medals and the coins.