"Afterwards, when most of the inhabitants of Greece were destroyed by flood, and all records and ancient monuments perished with them, the Egyptians took this occasion to appropriate the study of astrology solely to themselves; and whereas the Grecians (through ignorance) as yet valued not learning, it became a general opinion that the Egyptians were the first that found out the knowledge of the stars." -- Diodoros, historian, ~1st century B.C.
"And so even to the Athenians themselves, though they built the city of Sais in Egypt, yet by reason of the flood, were led into the same error of forgetting what was before." -- Diodoros, historian, ~1st century B.C.
Pyramids In Greece
There are more than 16 pyramids spread over Greece. The oldest one is the Pyramid of Hellinikon.
At the South-eastern edge of the plain of Argolid, near the springs of the Erasinos river (nowadays 'Kephalari') and on the main arterial road which in antiquity lead from Argos to Tegea and the rest of Arcadia and Kynouria, there is a small structure at present known as the Pyramid of Hellenikon.
The Academy of Athens has published results of dating the Hellenikon pyramid ( 9-2-1995). Dating measurements were performed by the Laboratory of Archaeometry at Dimokritos Resarch Institute in Athens and by the Nuclear Dating Laboratory of the department of Physics at the University of Edinbourgh in Scotland.
The method of Optical Thermoluminescence was employed to date samples taken from the pyramid. It was determined that the pyramid was erected at about 2720 B.C.
It must be noted that, according to these results, the Hellenikon pyramid predates, by at least 100 years, the oldest Egyptian pyramid (Djoser - 2620 B.C.) and by 170 years the Great Pyramid of Cheops (Khufu - 2550 B.C.).