The Piri Reis map of 1513 features the western shores of Africa and the eastern shores of North and South America and is also controversially claimed… - Graham Hancock

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The Piri Reis map of 1513 features the western shores of Africa and the eastern shores of North and South America and is also controversially claimed to depict Ice Age Antarctica — as an extension of the southern tip of South America.
The same map depicts a large island lying east of the southeast coast of what is now the United States. Also clearly depicted running along the spine of this island is a 'road' of huge megaliths. In this exact spot during the lowered sea levels of the Ice Age a large island was indeed located until approximately 12,400 years ago. A remnant survives today in the form of the islands of Andros and Bimini. Underwater off Bimini I have scuba-dived on a road of great megaliths exactly like those depicted above water on the Piri Reis map.
Again, the implication, regardless of the separate controversy of whether the so-called Bimini Road is a man-made or natural feature, is that the region must have been explored and mapped before the great floods at the end of the Ice Age caused the sea level to rise and submerged the megaliths.