Panzer VIII Maus
Panzerkampfwagen VIII Maus ("Mouse") was a German World War II super-heavy tank completed in late 1944. It is the heaviest fully enclosed armoured fighting vehicle ever built. Five were ordered, but only two hulls and one turret were completed before the testing grounds were captured by advancing Soviet military forces.
Tsar Tank
It differed from modern tanks in that it did not use caterpillar tracks—rather, it used a tricycle design, meaning it does not suit the modern definition of a tank. The two front spoked wheels were nearly 9 meters (27 feet) in diameter; the rear-mounted third wheel was only 1.5 metres (5 feet) high. The upper cannon turret reached a height of nearly 8 meters. The hull was 12 metres wide with two more cannon in sponsons. Additional weapons were also planned under the belly. Each wheel was powered by a Sunbeam engine.