<p>The ancient Incan city we know as 'Machu Picchu' should probably be called 'Picchu' or 'Huayna Picchu', according to a new analysis of historical documents.</p><p>In 1911, when the White American historian and explorer, Hiram Bingham, was first led to the ancient Incan ruins, he asked a local landowner to write down the name of the site in his field journal.</p>