Here's a really smart LEGO build. A tiny fully motorized remote-controlled accurate version of a WWII tank by a Polish enthusiast Sariel.
It even has a motorized barrel and a rotatable turret.
The whole build is really tiny and compact. It's only 4 inches wide and 8 inches long, yet it's full of LEGO's Power Functions elements inside.
LEGO obviosuly doesn't have official WWII sets, but this would look neat as part of a larger fan-built diorama.
Here's the full clip with the tank in action:
Sariel built different motorized tanks too. Here's an American M1A2 Abrams:
Or a Russian T-72 M:
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