A few Examples that have really stuck in my mind:
The recorded history of the Egyptians says their dynasties go back FAR longer than is accepted by modern Egyptology, yet we dismiss it. The water erosion on the sphynx, as well as the change in flow of the Nile away from some of thier earlier cities, backs up their claim. Techniques to "carbon date" stone have been dismissed largely because they tell us some structures are much older than we think. Not possible therefore the science must be wrong... but what if its the other way around?
Plato describes Atlantis in great detail, which was passed down to him from his elders. We actually know of a site that matches his description exactly in Mauritania, deep in the Sahara, which would have been an island 12 thousand years ago when seas were higher. It has all the exact dimensions he described correct and geography correct, has the same stone color as he described their buildings, has the springs on the central island, is beyond the straits of Gibraltar, and has plenty of artifacts strewn everywhere, yet we still dismiss it as a tall tale and no one will dig there:
https://en.wikipedia.org/wiki/Richat_Structure
You don't have to be a conspiracy theorist to take this stuff seriously. More than likely they were just a civilization advanced for their time (maybe Roman era advanced) but something happened to them. The Richat is likely a natural volcanic anomaly that they simply built on.
Plenty more where that came from that challenge our recorded history:
https://en.wikipedia.org/wiki/Gunung_Padang_Megalithic_Site
https://en.wikipedia.org/wiki/Gornaya_Shoria_megaliths
https://en.wikipedia.org/wiki/Gobekli_Tepe
And to top it all off, I think most likely the Younger Dryas Impact Event described by Randal Carlson (great Joe Rogan Podcast about this out there) is the "Flood" event recorded by multiple cultures and responsible for wiping out traces of civilization past 12,000 years ago. This 12,000 year number recurs over an over when we talk about these sites that defy the narrative that it all started in Mesopotamia:
https://en.wikipedia.org/wiki/Younger_Dryas_impact_hypothesi...
Again, personal opinion here, but it sure as hell all lines up.