Killen-Straight armored tractor, a contender for the title of "First Tank". I guess I didn't really know that tanks evolved from tractors, but it makes perfect sense. The treads were chain and hardwood!
Killen-Strait Armoured Tractor
Panzer tank hull being quenched
Tank drives underwater - GIF
Can you own your own tank?
Tank bridge - GIF
Train tank - photo
1942 Soviet tank glider - photo and diagram
Starting up a WWII tank on a Ukrainian monument - video