Lubuskie·Poland
Photo: Łukasz Świerczewski · Wikimedia Commons (CC BY-SA 4.0)
The Nietoperek reserve uses the wartime tunnels of the Międzyrzecz Fortified Region as a winter roost for tens of thousands of bats of a dozen species, making it one of the most important hibernation sites in the European Union. Access is tightly limited to protect the colony.
In season: Dec–Feb · Peak: Jan–Feb
A guided visit inside the cold tunnels during the winter count, moving quietly among hibernating bats. Visitor numbers and routes are strictly controlled, and in some winters access is closed entirely.
One of Europe's largest hibernating bat colonies, guided only
Ask the fortification route operators and the reserve managers about guided winter visits, which must be booked well ahead. Dress for cold, wet tunnels.
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