Nietoperek reserve is an extensive underground network of fortifications, raised by Nazis, with the 30 km of total length of tunnels. There is the bats' colony the biggest in central Europe. There is even 30 000 individuals from 12 species hibernating here in winter. The Nietoperek refuge is the Site of Community Importance. The underground reinforced concrete tunnels have specific microclimate. The temperature is constant and comes to 9°C, and the humidity of air is high. more »

Nietoperek spot is situated by the main national road no. 3 between Miedzyrzecz and Swiebodzin. more »