Been on this last year on a day trip to Genoa.   Really fantastic, and the merger/transfer point between horizontal to vertical is amazing engineering!   Worth seeking out, and the castle district at the top is fun to walk around in.   Also, make sure to see the Maritime Museum....state of the art museum about the ship building history of the city.   On the top floor is an area dedicated to the Italian emigrants to North and South America with immersive experiences and computer databases to see if your family went thru Genoa.