The II.a/58/B bunker is a military fortification located in the Czech Republic, near the town of Hradec Králové. This structure is part of the Czechoslovak interwar defense system, built in the 1930s as part of the border fortifications designed to protect against potential German aggression. The bunker features reinforced concrete construction typical of the era, with thick walls and strategic firing positions.
It represents an important example of Central European military architecture from the pre-World War II period.