The Piri Reis map is back on display at the Topkapı Palace in Istanbul. Like the Tabula Peutingeriana, it’s only taken out for display at intervals to protect it from the elements. Discovered when the palace was being converted into a museum in the 1920s, the map is the western third of a portolan chart drawn on gazelle skin parchment in 1513 by Ottoman admiral Ahmet Muhiddin Piri (“Reis”—admiral—was his title). It was an expansive compilation of ancient and contemporary sources much like the Waldseemüller map, and is fascinating in its own right; in recent years, though, it became one of the “proofs” of a nutty theory involving ancient civilizations and polar shifting. [Tony Campbell]

Previously: The Piri Reis Map of 1513; A Turkish Piri Reis Documentary Is Coming.