I came across this picture of a rather strange vehicle prototype from 1914. The Lebedenko Tank or Tsar Tank was designed to Cross any obstacle, including trenches and ran on two large and one Small wheel. Unfortunately in its one and only trial the small wheel stuck in a ditch and the engines proved insufficient to pull the 40 ton vehicle out.The final design would have featured several weapon turrets. The hull of the vehicle was designed to have one top-mounted turret, equipped with MG's and/or light cannons. In addition to this, on the outer flanks of the hull, small MG turrets would have provided anti-infantry protection.
As it was the trails were such a resounding failure that they left the prototype where it stuck until 1923 when it was broken up for scrap. The design may have been impractical in 1914 but it allegedly inspired the design of the IG-227 Hailfire-class droid tank from the Star Wars Prequels.