Impressions to the European Fortress Summer 2018

44 European Fortress Summer 2018 www.fortress-summer.eu 2000 years of defensive Cologne. A city with two distinctive green belts and radial green belts has been characterized since ancient times by the construction of walls, ditches and ramparts to the extensive fortifications of several periods. These cultural assets include the Roman wall in the city center, the medieval city gates with city walls, which caused the course of the ring road and thus represented an early re- Fortified city Cologne anno 1646 quirement for today concentric city construction, as well as the also concentric Prussian fortifications of the fort- ress Cologne. The association Fortis Colonia e.V. has dedicated itself to the history, the monument protection, the nature protec- tion and the preservation of the historical fortress herita- ge of Cologne.