Look up at the striking tower rising above the main entrance—the Filarete Tower, named after its architect, Antonio Averulino, known as Il Filarete. Originally built in 1452 in Renaissance style, it was blown to pieces less than a century later when its use as a gunpowder store led to a massive explosion. The tower you see today is a reconstruction by architect Luca Beltrami in the late 19th and early 20th centuries. Notable additions by Beltrami include the marble bas-relief of King Umberto I, to whom the tower is dedicated, the statue of St. Ambrose, patron Saint of Milan, above it and the clock near the top. But what awaits on the other side?