Regenwurmlager, Military fortress in Międzyrzecz, Poland
The fortification system encompasses 100 concrete defense structures connected through 32 kilometers of underground tunnels reaching depths of 40 meters.
German engineers constructed this defensive network between 1934 and 1944 to protect the eastern approaches to Berlin during World War II.
The fortress stands as a testament to military engineering, featuring railway stations, workshops, and specialized combat positions throughout its underground network.
Visitors can access the fortress through two designated museum entrances, where guided tours explain the complex military infrastructure.
The tunnel system now serves as the largest bat hibernation site in Europe, sheltering over 39,000 bats of different species during winter months.
Location: Kaława
Location: Pniewo, Gmina Międzyrzecz
Location: Nietoperek
Inception: 1934
GPS coordinates: 52.36667,15.50000
Latest update: May 26, 2025 21:31
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