Step back in time on Via San Marco to a spot where Milan's history flows visibly through the city. Here you'll find the impressive remnants of a canal lock system that the great Leonardo da Vinci himself perfected. Imagine the barges that once passed through, connecting the city's waterways, as you admire the preserved wooden gates and the clever engineering of the Renaissance. It’s a fascinating and quiet glimpse into the Milan of the past, hiding in plain sight.