Ferrara is a city in Italy’s Emilia-Romagna region. It’s known for the buildings erected by its Renaissance rulers, the Este family. These include the moated Este Castle, with its lavish private chambers. The family also built the Diamanti Palace, which is clad in diamond-shaped marble blocks and home to the National Picture Gallery. The Romanesque Ferrara Cathedral has a 3-tiered facade and a marble bell tower.