Entering the citadel, you pass under the massive Clock Tower, which dates from 1280 and once housed the town council. Formerly the main entrance to the fortified city, the tower is 64m tall, with sturdy base walls measuring an impenetrable 2.35m. Inside, the 1648 clock is a pageant of slowly revolving 80cm-high figurines, carved from linden wood, each representing a character from the Greek-Roman pantheon: Peace bears an olive branch, Justice has a set of scales and Law wields a sword.

The executioner is also present and the drum-player strikes the hour. Above stand seven figures, each representing a day of the week.