The heart and soul of this engaging museum are the working scale modelsof Leonardo's submarines, airplanes, and other engineering feats that, for the most part, the master only ever invented on paper (each exhibit includes a reproduction of hisdrawings and a model of his creations). This former Benedictine monastery and its beautiful cloisters are also filled with planes, trains, carriages, sewing machines, typewriters, optical devices, and other exhibits, including some enchanting recreations of workshops, that comprise one of the world's leading collections of mechanical and scientific wizardry.