A unique light fortification on Kostrlík Hill in Bílina.

The first objects of light fortification began to be built in 1936. Simple fortifications were then designated according to the year of creation. In 1937, new types of light fortifications were built, designated as model 37. According to the name of the Directorate of Fortifications, light fortifications began to be called ropíky. On the Kostrlík Hill in Bílina, a three-shot bunker type C model 36 was built just below the summit with a uniquely designed...