One of the places to visit in Polish Wroclaw is the Military museum. Although it is definitely not the biggest nor richest museum in the world, man can spend few exciting hours there. The entrance is free and the exposition includes literally everything, from medieval to WW2 weapons, armors and uniforms or helmets. Just the light wasn´t perfect, so sorry for the quality of photos.
Probably the most famous Russian machine gun invented in the first decade of 20th century is still in use (Civil war in Syria or Ukraine). The exhibits are lying on the floor so one can look close up, or even touch them.MG 34
Famous German machine gun from WW2. Current modification MG 3 is still used by German Bundeswehr
Mix of anti-tank weapons
German police helmets
Vietnamese tropical helmet