Building from 1935-1938 is the most preserved building of its kind in the Czech Republic. It comprises of five battle buildings of the highest degree of resistence (walls and ceiling panels are 350 cm thick) and an extensive system of underground corridors and a room deep in the rock (ca. 1.5 km long). A monument is situated in the war barracks in the underground fortress, with a complete list of casualties and those murdered by the border guards in the autumn of 1938 to the spring of 1939.