Of the many, many conspiracy theories out there, here are two less known ones that I quite enjoy for their entertainment value:
In 1991, Heribert Illig proposed that the years 614-911 AD didn’t happen. They are fake, made up. Charlemagne never existed, and all historical documents from those years are forgeries. In terms of inventiveness, it’s a great theory and it’s easy to understand. The same cannot be said of the World Ice Theory, invented and publicized by Hanns Hörbiger in 1912. The theory itself is impossible to comprehend, which didn’t stop it from gaining many adherents in the first part of the 20th century, including leading Nazi Heinrich Himmler.
Nehaveigur 