3. Wenceslas Mine, PolandWenceslas Mine is located in southwestern Poland. This place has been rumoured to be the site of a secret World War II program to build a propulsion unit for Nazi UFOs.
True believers say the technology for this mysterious device, known as "The Bell," came from a highly advanced alien civilization that was in cahoots with Hitler and the Third Reich.
However, more rational researchers point out that if the Nazis truly had superior technological help from ETs, they probably could have won WWII.