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.
Steam-powered vessels
The "Seawise Giant" supertanker was the largest steam-powered ship ever created and the largest ship ever built, before it was scrapped in 2010. It was over 450 meters in length.