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.
Super-heavy tank
The idea of very heavy tanks saw less development after the war, not least since tactical nuclear weapons would always be more powerful than any feasible armour could protect against. The advances in armour technology allowed large tanks to stay in the approximate up to 65 ton range. Examples include Object 279 (Soviet Union) and T30 Heavy Tank (United States).