Some pretty images of Atlantis.
https://www.reddit.com/r/papertowns/comments/64cn97/the_mythical_city_of_atlantis_as_described_by/?rdt=32814
https://www.google.com/search?q=images+ancient+aliens+how+atlantis+looked&sca_esv=ff0c03999835dfdd&udm=2&biw=877&bih=399&ei=6xetZ_XNLLz-ptQP3puu8Qs&ved=0ahUKEwi174KSj7-LA
I believe the ancient Aztec capitol, which has since become Mexico City, was built in a similar fashion on a lake.