The clock tower, originally part of the town's defensive walls, was part of the Governor's Palace, which was demolished at the end of the 19th century. At the top of the tower is a bell cast in 1564, which has long been a reliable herald of a new hour. In the past, there was a large dome above the bell. It also had a dial in the 18th century, with only one hand. The current form of the clock with a glass wall dates to the beginning of the 20th century.