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Herodotus was vilified as the father of lies because his claims of amazons living on the steppes to the north east of Greece were discredited. Until evidence of a culture matching his descriptions were found. I would consider Herodotus a reasonable and honest witness, any criticisms belonging to the nature of his sources.
I agree that there is overwhelming evidence that the pyramids at Giza conform to within a few hundred years of the standard dating. Structures such as the sphinx being another matter.
Strangely the idea of civilisations being swept away by catastrophy fits well with evolution. Beings with the more sophisticated, specialised lifestyles are the most likely to be extinguished under extreme circumstances.