A fortification complex from 1935–1938.

The Stachelberg fortifications complex was built in 1937–1938 in a place called Babí u Trutnova located at the eastern fringe of the Krkonoše Mountains, as a part of fortifications system of the pre-war Czechoslovakia.

Urban monument reservation. A military bastion fort with underground corridors founded in the second half of the 18th century. The sightseeing tour with the underground labyrinth, the atmosphere of which is emphasised by the lighting with wax candles. Lapidarium with baroque statues by M. B. Braun. M. Frost's First Military History Museum.

The artillery fortress Hanička is a part of the pre-war fortification system built in the 1930s primarily with defence against Germans in mind.