The Town's Tower is the most imposing town edifice which strongly marks the townscape. It was mentioned in 1376 in the Town's Statute. Before that, a baptistery of St John the Baptist stood there. In 1556, the Italian builder Antonio de Riva was commissioned to build a new tower. After the great conflagration in 1705, the citizens lowered the tower a bit for safety reasons.
In 1830, the curate from Ptuj, Simon Povoden, built in the Town's Tower all collected antiquity monuments from Ptuj and the surroundings. Thus was established one of the oldest lapidaries in the open air in Slovenia, called the Povoden Museum. The majority of monuments are built in the eastern wall and in the base of a double-shouldered staircase. Right of the staircase is a relief plate representing a seat of honour, which was probably dedicated to some higher administrator. On the top of the staircase, there is a stone lion, and beneath it a girder in the form of a bow bears an inscription on both sides. To the left is a sacrificial altar dedicated to Marmogius, the god of War, and to the right is the altar to the god of Sun. The lower part of the staircase is interesting also because of a relief plate depicting three men (vicomagistri) at a sacrifice. Moreover, next to this relief, there is a bigger part of a relief plate from the 2nd century. The bottom of the staircase is embellished with two squares - a genius of the Autumn is carved on the right one, and the genius of Spring and the goddess of Summer, Hora, are on the left square. To the Povoden Museum equally belong sacrificial altars dedicated to the supreme god - Jupiter.
