The Tsar Tank (also known as Lebedenko Tank)

The Tsar Tank (also known as Lebedenko Tank) was an unconventional Russian armored vehicle developed by Nikolai Lebedenko and a team of engineers in 1914-1915. It differed from modern tanks in that it did not use caterpillar tracks—rather, it used a tricycle design. The project was scrapped after tests proved the tank was underpowered and vulnerable to artillery fire. The single built tank was finally taken apart for scrap.