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.
Seawise Giant
Despite its great length, "Seawise Giant" was not the largest ship by gross tonnage, ranking fifth at 260,941 GT, behind the four 274,838 to 275,276 GT "Batillus"-class supertankers. It is the longest and largest by deadweight: 564,763 tonnes. "Batillus"-class ships and "Seawise Giant" were the largest self-propelled objects ever constructed.