Surviving remains above water of Antediluvian civilizations (many pyramids & megalithic structures remain under water along the world's coastlines; or under Antarctica's ice or buried under many feet of clay. Atlantis & other ancient civilizations were destroyed in several world cataclysms (from Anno Mundi 669 or 4,500 BC to AM 2453 or 1,100 BC). "Temples" & pyramids (also high-tech machines) were the Manors of ancient Lords & rulers (called gods by the Greek). For more details see Mythos & Cosmogony