Castelvecchio is a XIV century fortress where one can find the "Civic Castelvecchio Museum and Museum of Art." In the middle of the castle there is a passage dominated by a tower. It has many walls with towers and battlements. It is a very strange place, as the corridor between two of the walls is made into a pedestrian street.
The Castel San Pietro (Verona, Italy) stands atop a hill with the same name. For centuries it was a place of high strategic importance, as from its privileged position, it could control the entire city. In 1801, much of the castle and its auxiliary buildings was destroyed by Napoleon's troops. Between 1852 and 1853, the current headquarters were erected. The enclosure is irregular, due to the contours of the land on which it is built. Despite a long period of neglect, the current condition isn't too bad.
It's a good spot to go to enjoy a lovely view of the city of Verona. The interior of the castle is open to the public, and it's just 15 minutes walk from the historic city centre. From the Piazza delle Erbe you should continue until you cross the river Adige and the Ponte di Pietra. After crossing, take a narrow street that eventually becomes the stairs leading to the top of the mountain. The climb is not too long or too steep, so it can be done without much effort. At the top, you'll be rewarded with truly beautiful views.
A beautiful Renaissance clock tower stands in the north part of the square on an arch leading to the Mercerie. Built in the fifteenth century it's believed that the central section was designed with sailors in mind, it shows the phases of the moon and the zodiac.