On October 9, 1929, a German theologian named Gustav Adolf Deissmann was cataloguing items in the Topkapi Palace library in Istanbul when he happened across a curious parchment located among some disregarded material. On the gazelle skin parchment was a map, now referred to as the Piri Reis map.
The map was drawn and signed by Turkish cartographer Hagji Ahmed Muhiddin Piri, aka Piri Reis, and is dated to 1513 AD. Reis was an admiral in the Turkish navy, an experienced sailor, and a cartographer, who claimed to have used 20 source maps and charts to construct the map, including 8 Ptolemaic maps, 4 Portuguese maps, an Arabic map, and a map by Christopher Columbus.
Since its discovery, the Piri Reis map has stirred both intrigue and controversy, mostly due to the presence of what appears to be a representation of Antarctica 300 years before it was discovered. Another—if not even more intriguing facet of the appearance of Antarctica—is that it appears to show the land mass before it was covered in ice, over 6000 years ago.