Międzyrzecki Rejon Umocniony Muzeum Fortyfikacji i Nietoperzy, Military fortification museum and bat sanctuary in Międzyrzecz, Poland
The Międzyrzecki Rejon Umocniony is an underground fortification system with an extensive network of tunnels and concrete bunkers. The installation includes ventilation systems, water supply, and communication facilities that show how this hidden military site was designed to function.
The system was built between 1925 and 1941 as an eastern defensive barrier and stretched across a huge area. After World War 2, other forces took control and used the facilities for different purposes.
The site tells its story through displays of weapons and equipment that show how people worked and lived in this underground world. The spaces today give visitors a sense of military daily life and strategy in this hidden environment.
The site is best explored with guided tours offered daily, providing different route lengths for various interests. Visitors should wear sturdy shoes and be aware that the tunnels are cool and damp.
The bunkers shelter tens of thousands of bats during winter months, where they retreat to hibernate. This underground refuge is one of the largest natural retreats for these animals in Europe.
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