I suppose I should mention this even though it's very sketchy information.
There is a lake (Rock Lake) which is rumored to have pyramids underwater in it.
Supposedly unsolved mysterys (or one of them) came last winter and did tests
through the ice. Also divers have found some artifacts there. Rumor has it that
they are not just rock piles, but stones are placed together with mortar. It's
within a few miles of Aztalan (a site where truncated mounds/pyramids of earth,
similar to Cahokia are found) and it seems like nothing much is being said or
done about the underwater find at this time. I'll have to go sit in a bar next
to the lake and probe the locals for more insite. I'll be sure to take notes