*Everybody stares in awe that professor stampede is actually posting on the a-m-v.org forum*
Anyways, great big machines? There aren't any shortage of those in anime. Sure, you could use all kinds of giant robots, like RahXephon, all the Gundams, Nadesico, Mazinger, etc, etc. But lets get more creative than that. How about the city from Metropolis, and, oh I can't help it, the plants from Trigun?