Around the size of a sedan, this particular model artillery boasts functional tractor treads, an engine ... a WW1-era combat ...

How did the guns operate? How was the fuel stored? What were conditions like inside? Find out with this animated version of a Mark 1 Tank.

The tank was designed to withstand machine-gun fire ... The only ventilation was concerned with the engine and not for the crew. You could only see forward through a little slit in the front ...