During World War II, Nazi engineers designed and built a number of revolutionary super or "wonder weapons" (wunderwaffe), including a wide array of aircraft, guns, and ships. Among these weapons is a mysterious small, round tank named the Kugelpanzer (literally meaning "spherical tank"). This odd little tank was never seen in the European theater, and very little is definitively known about its purpose.
What is known is that it was made in Germany and shipped to Japan, and then later captured by the Soviets in 1945, probably in Manchuria. Today, the only one known to exist can be found in the Kubinka Tank Museum in the Odintsovsky District, Moscow Oblast, Russia.