A military bunker located near Bratislava, Slovakia, part of the Czechoslovak fortification system built in the late 1930s. These fortifications were constructed between 1935 and 1938 as part of a massive defensive line designed to protect Czechoslovakia from potential German aggression. The bunker B-S 4 "Lány" is now preserved as part of the Czechoslovak Fortification Museum, offering visitors insight into this significant period of military history.
The fortifications represent an important chapter in Central European military architecture and the prelude to World War II.