Winter habitat for bats
Fort Blücher (Wesel)

Opposite the city of Wesel in the Büderich district, Fort Blücher is located, once a bridgehead. Today, it serves as a winter roost for bats.
History+
The origins of the fort date back to the Napoleonic era. Between 1807 and 1813, it was built under the name “Citadelle Napoleon” by order of Napoleon Bonaparte. After a six-month siege of the Wesel fortress, the citadel also fell to Prussian troops. Under the direction of fortress engineer Gotthilf Benjamin Keibel, a reconstruction took place, changing the orientation of the defensive structures to the west. During this time, the complex received its current name, named after Field Marshal Blücher.
Source: Wikipedia · Licence: CC BY-SA 4.0
This description draws on the facts documented in the linked Wikipedia article; Wikipedia content is licensed under CC BY-SA 4.0. Wording and editing: Mobile History.
Location: 51.6437, 6.5975