Eschenheimer Turm, Frankfurt am Main

Eschenheimer Turm is a circular tower which was built as part of the Medieval wall which encircled the city. Beginning in the 15th Century, Frankfurt's citizens tried to protect themselves with high walls, water barriers and watchtowers like the Sachsenhäuser Warte in the south of the city; the Bockenheimer Warte and the Friedberger Warte in the north and west. Approximately 60 towers surrounded the city to protect its citizens from all kinds of dangers from the countryside.