Landkreuzer P. 1500 Monster
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The Landkreuzer P 1500 Monster was a purported German pre-prototype super-heavy self-propelled gun designed during World War II. Wikipedia
Armor: 250 millimetres (9.8 in) (hull front) 200 millimetres (7.9 in) (hull sides) (800mm gun variant)
Crew: 100+
Engine: 4 × Daimler-Benz MB.501; 6,000 kW (8,000 hp)
Height: 8.25 metres (27.1 ft) (800 mm gun variant)
Main armament: 1 × 800 mm gun OR 1 x 600mm mortar
Maximum speed: 7 km/h (4.3 mph)