Kubinka Tank Museum
One of the biggest museums in the world of armored vehicles and weapons. Founded in 1938 as the Museum of military vehicles. Military equipment is presented in 7 hangars:
Hangar 1: the Soviet heavy tanks and self-propelled guns;
Hangar 2: Soviet medium tanks and assault guns;
Hangar 3: Soviet light tanks, tracked armored personnel carriers, amphibious tanks and crank at their base, armoured vehicles and armament of airborne troops;
Hangar 4: Soviet armored vehicles, armored personnel carriers and infantry fighting vehicles.
Hangar 5: USA tech and UK
Hangar 6: armored vehicles of Nazi Germany
Hangar 7: armoured fighting vehicles of France, Italy, Czechoslovakia, Hungary, Poland, Sweden, Japan and China
There are unique exhibits: a super-heavy tank "mouse" (ger. "Maus"),
600-mm self-propelled mortar "Karl" and "Object 279".
To get there: On the Minsk highway to Kubinka, turn around on the bridge, turn right at the tank-memorial
Sadly the German pavilion had been recently relocated to another location, however the Maus and some other machines are still there.
Please note that nothing is in English (including people) and getting to this place on public transport might prove tricky. And well, the quality of everything is quite sketchy. Make sure you go with someone who speaks russian, otherwise these f***ers will scam you into paying three times the actual ticket price.
Ps, beware of cafeteria food