I can vaguely remember an old manga-type film which envolves these two kids on an island or planet which looks kinda like an incan ruin, with everything all overgrown.

I think they then get undergraown somehow, and it turns out to be a huge machine city, but everything is dead..

I think they re-activate a huge robot....

Does this ring any bells? It's one of those things that's been driving me mad for years. I loved it at the time, but that's not saying it's good....


anyone??