This is a good summary of the most plausible theory on POLE SHIFTS, Ice Ages, geological cataclysms, and the periodic destruction of civilization – and as discussed at length my books like: End Times and 2019
and as of April 2018, discussed for an entire book:
POLE SHIFT: Evidence Will Not Be Silenced
In the video below, author Graham Hancock also mentions books by Charles Hapgood like Earth’s Shifting Crust or Maps of the Ancient Sea Kings… and When the Sky Fell by Rand and Rose Flem-Ath… and of course Hancock himself has written several worthy books like The Mystery of the Sphinx and Fingerprints of the Gods…
[youtube https://www.youtube.com/watch?v=QwYkOu8J3vk&w=1280&h=720]