The Mona Lisa, painted by Renaissance master Leonardo da Vinci in the early 1500s, is one of the world's most famous paintings. More than 9.3 million people visited its home at the Louvre in Paris, France in 2013 to catch a 15-second glimpse of it.

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Behind that enigmatic expression, however, there are secrets, dear reader. Secrets unlike those that art historians or best-selling novelists could have ever imagined. Because if you look at the Mona Lisa from just the right angle...

Behind that enigmatic expression, however, there are secrets, dear reader. Secrets unlike those that art historians or best-selling novelists could have ever imagined. Because if you look at the Mona Lisa from just the right angle...