While not a fraud he does tend to get lauded too much for his accomplishments. The more you learn about him the more you despise the man. Yet the USA dedicated a holiday to him.
There appears to be a certain type of American who seem to be very attached to ideas that Columbus was the first white, European to find the continent, and that Native Americans (in the Continental US, not "natives" further south) were basically barbarians with a lack of both skills and permanent presences in things like mining. Yet the Vikings from signs being dug up in Newfoundland discovered the place long before Columbus, not to mention the Basques were fishing the Grand Banks as long as 2000 years ago, not to mention the Piris Reis map showing "something" being out that way, and the name Brazil comes from the old legends of Hy-Brasil, a land mass to the West, and Cocaine found to have been used by ancient Egyptian Mummies, well, before they became mummies one assumes
. I suspect a lot of "discoveries" from the past were simply rediscoveries, especially since as mentioned, clearly people got there thousands, or hundreds of thousands of years ago.
If the Welsh Legends of Prince Madog are, simply that, myths, then the Native American tribe supposed to be the one his people intermixed with were a very permanent tribe, unlike the others, and again under the idea some (I assume Bigots) hold that the Natives were barbarians with no permanence, these people defy it having lived in stone villages built around a central square. And evidence has been found of ancient mines being excavated by Native Americans a couple of thousand years ago.
I was chatting about this with Baylor, the OP the other day - we suspect that for example the Destruction of the Library of Alexandria may well have lost to us, incredible revelations about what was really known and discovered about the world in ancient history. It would equally not surprise me if the Vatican held in its Archives copies of or information on some - not intentionally suppressing it - they simply don't know they have it, having been run by centuries worth of by avid collectors and preservers of knowledge, and of course donations, I imagine the filing system is a little "anarchic" at best!
In a way it's sort of good, in that it means there are still things to explore, to theorise about, and to stir the imagination.