Pighin Tower is one of the only three remaining medieval towers in Rovigo, the other two being part of a former castle. It was once part of the city walls that once surrounded the town, but today it stands as a residential building. The structure was built in 1138 during the construction of the city walls. At first glance, the 23-meter (75 foot) brick tower looks like a typical medieval fortification. But if you look at the side facing towards the city center, its unique properties become apparent: A whole…