People speculate that the city of Atlantis was actually a civilization of aliens that had setup a colony on earth. Hence, brought the electricity, medicine, etc.. with them from their home planet.
I find this to be mildly logical; however, unprobable. In short, do I believe the city existed? No. Could it have? Absolutely.
I would love if one day in my lifetime we find it though, I'd be on the bandwagon like a mexican to the border
