I've done a little digging on the Nazi's technology developments, and I have to say, while it is fascinating, it also scares the hell out of me that they were
a) so deluded over certain ideas
b) so close to completing so many powerful weapons
Although I've not heard of the Amerika quarry, it sounds a little like The Bell (http://www.americanantigravity.com/einstein.shtml
), but that was in Poland, and there's a lot of uncertainty over what it was.