Wesel citadel built
1800 CE.
Shown on the map at 51.652°, 6.615°.
The Wesel Citadel is the largest intact fortification system of the Rhineland, built 1688–1722 in Wesel. It was built according to plans by Johan de Corbin, in the form of a pentagonal star, with each point of the star being a bastion. The citadel was the core of the fortress of Wesel, and is currently used as a cultural centre.
Text from the Wikipedia article Wesel Citadel, licensed CC BY-SA 4.0.