One of the symbols of Milan, the Sforzesco Castle houses the very interesting civic collection of the city's museums. Established since the nineteenth century, the collection includes paintings, sculptures, furniture, ceramics, tapestries and much more. And, as in any castle, a mysterious secret passageway cannot be missing: according to some, walking along it would lead to the Church of Santa Maria delle Grazie. Unfortunately, the tunnel is blocked by a landslide.