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This historic attraction offers a unique insight into Poland during the Second World War. The region was a fortified military defense line created by the Nazis between the Oder and Warta rivers during the 1930s.

The area consists of approximately 100 concrete defensive structures interconnected by a network of underground tunnels stretching nearly 100km in length. The underground system, which is home to subterranean railway stations, workshops and engine rooms, has even more to offer – this unique habitat has become a perfect home for bats that live here and can be spotted during a visit!

ww.poland.travel/en/underground-tourist-routes/miedzyrzecz-fortified-region-underground-tourist-route

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