Tour d'Alexandre

Tour d'Alexandre is a medieval round stone tower in Mainz with a sloped base foundation and a ring of embrasures marking its upper section. The structure demonstrates the defensive architecture typical of watchtowers from that era.

Built around 1500, this tower stands on foundations from a Roman watchtower that once marked the northwest corner of ancient Mogontiacum's fortifications. The Roman origins reveal the strategic importance of this location across multiple centuries.

The tower received its current name after the construction of the Alexander Barracks nearby, though locals previously knew it as the Round Windmill Tower and later the Powder Tower. It stands as a reminder of the city's fortification system that once protected the urban center.

The tower sits on private property belonging to the Kupferberg wine cellars in the Kästrich district and remains closed to visitors. You can view the exterior from nearby streets and surrounding areas.

This tower is one of just three surviving structures from Mainz's old city walls, alongside the Wood Tower and Iron Tower. These three towers offer a rare glimpse into the city's former defensive network.