Care to explain the pictures?
1. Maus superheavy tank 190 tonnes of weight, 128mm main gun, two prototypes were made, the thing was torturously slow and few bridges could take it, it was supposed to be followed by a 1500 tonne landcruiser tank.
2-4 experimental mine clearing vehicles, 3rd one is American i think.
5. Russian transport plane, dont remember the type but it was experimental, it was boeing sized and they even tried to slap some armored turrets with huge caliber guns onto it.
6. pre-war experimental Tsar tank, Russians tested it but it kept toppling over because of these huge wheels plus they were pretty fragile with all these spokes so they scrapped it.
7. tankplane, Russians took the all-terrain concept to the limits and tried to make an armored airplane that could fight equally well on land and in the sky.
Also Germans were on their way to build this:
Ratte - 1500 tonnes, main gun taken off a battleship and about 20 other guns slapped in various places, they actually made a turret for that thing but didnt make it in time with the rest before the war was over.
This was simply a copy of the American made Bazooka - the Germans copied the specification exactly.
Actually no, they made it a lot better having about 4 times the effective range of the American models.