The 5th Fort Museum, Brest

Brest Fortress, formerly known as Brest-Litovsk Fortress, is a 19th-century Russian fortress in Brest, Belarus, the former Byelorussian SSR. In 1965, the title Hero Fortress was given to the Fortress to commemorate the defence of the frontier stronghold during the first week of the German-Soviet War, when Nazi Germany invaded the Soviet Union on June 22, 1941, with the launch of World War II's Operation Barbarossa. The title Hero Fortress corresponds to the title Hero City, that was awarded to an eventual total of twelve Soviet cities. Brest Fortress is situated at a height of 135 meters.
The Brest fortress has sustained its original outline of a star shaped fortification since its construction in the early 19th century. The Citadel, the core of the fortress, was on the central island formed by the Bug River and the two branches of the Mukhavets River. The island was skirted by a ring of a two-storied barrack with 4 semi-towers. The 1.8 km long barrack comprised 500 rooms to accommodate 12,000 soldiers within thick walls built from super strong red bricks. Originally there were 4 gates to enter the Citadel. Today only Kholm Gate and Terespol Gate can be seen, most part of the barrack lies in ruins.