The globe was offered for sale in 2012 at the London Map Fair held at the Royal Geographical Society.[1] Its similarity to the Lenox Globe was confirmed by the former president of the Coronelli Society, Professor Rudolf Schmidt, and confirmed by art expert Archduke Dr. Géza von Habsburg in 2013.[3]: 11, 15 

The owner of the globe, Stefaan Missinne, has written a book that argues that the globe was made by Leonardo da Vinci,[2] citing writings by Leonardo indicating a similar approach to making globe gores.[3]: 19 [a] Cartographer Wouter Bracke states that Missine's book should be considered "a report on the author's research into the globe and [not] a final scientific and academic publication", and that Cambridge Scholars Publishing's lack of editorial board "clearly failed to guide the author in the preparation of his publication". Ultimately, Bracke states that more research is needed to conclude the question of the globe's age and provenance.[6]

https://en.wikipedia.org/wiki/Ostrich_Egg_Globe

There was a book in the 70s that claimed that aliens had visited Earth and were responsible for the pyramids and other things.
One supporting fact was that DaVinci was just too advanced and talented to have been a 15th century human. I don’t actually believe that, but the man was a genius-level freak of nature.