The Pinacoteca Ambrosiana (Ambrosian Art Gallery) was the first art gallery in the world to be opened to the public and is locate in downtown Milan, near the Duomo Cathedral. The artworks part of the Ambrosiana cover the whole span of art history, especially Italian, from the Renaissance to the nineteenth century.  But the greatest artistic and scientific treasure of all in the Library is the famous Atlantic Code by Leonardo da Vinci, donated to the Ambrosiana by the Marquis Galeazzo Arconati in 1637:  it includes 1119 original pages, with approximately 2000 drawings, notes, autobiographical notes  and studies on various disciplines:  engineering, hydraulics, optics, anatomy, architecture, geometry and astronomy.