Just came across this interesting piece on
The map was found in 1929, in the Imperial Palace in Constantinople.
Charles H.Hapgood - Historian, Geographer, University of New Hampshire.
Book: Maps of the Ancient Sea Kings.
The conclusion that Hapgood reached was that
a civilisation with high seafaring and mapping skills surveyed the entire earth in the ancient past.
They left maps which have been copied by hand through many generations.
The Piri Re'is map is a patchwork which has gaps (most notably the Drake Passage between S.America and Antartica.
The Piri Re'is map is one of the cornerstones of the growing body of evidence for an unknown Ice Age Civilisation
Books: Hamlets Mill - by De Santilla and von Dechend (1969) and the works of Graham Hancock
According to Hapgood, who based the claim on 1949 core samples from the Ross Sea ....
.... the last time the particular area shown in the map was free of ice, was more than 6,000 yrs ago.
There is no scientific explanation for a mechanism which could cause such a global transformation in a matter of hours without completely destroying the crust of the planet.
One proposal was a global shift 9,500 yrs ago.