There is one mystery that has long troubled many researchers which is the Dark Middle Ages and the hypothesis that it never actually happened.
I have always been skeptical of the official narrative of the development of a civilization that flourished in ancient times, and even in antique times, and then literally enters the complete darkness of the Middle Ages, and to add to all of that, resetting the time to zero year.
You can find the full article on our Patreon channel about the 1000 years missing from our timeline.