For many centuries, Mainz has been surrounded by a city wall. Along the wall are several guard towers, some with foundations dating from Roman times. The Eisenturn is one of these guard towers along the city wall, however, it is a little more modern... it was constructed in the Middle Ages, during the 13th Century.
The tower was badly damaged during WWII, but was repaired and restored in the 1970s. During this time, the city wall on either side of the tower was removed.
Next to Alexanderturm and Holzturm one of only three remaining towers from the old city defence system. Its history is similar to the Holzturm: Built in the 13th century and expanded in the 15th . In the 17th century, it was converted into a prison which was used until the late 19th century. The main difference however is the architectural style. While Holzturm has typical pointed arch windows and turrets of Gothic architecture, the Eisenturm is Romanesque. It may not have the splendid turrets, but there are some nice details to discover like the small lion sculptures. Eisenturm is used by some artist organisations and has even a small exhibition room. In front of the tower, you will find the "Eisenmann" sculpture, an "iron man":
This tower was built in 1240 as a watch tower. It was one of 34 towers of the old citywall. Its name derives from the iron market that was held in front of the tower. Today it is used as an art gallery.