The 20.5-meter-high late Gothic corner tower of the old city fortifications was built in the 15th century and was formerly located directly on the Rhine. The dungeon located in the basement was only accessible through an opening in the arch. In the previous century, the tower housed the inn "Zum Adler," from which the name of the tower is derived. Johann Wolfgang von Goethe stayed there during his visits to Rüdesheim.