A prankster and genius, Leonardo da Vinci is widely believed to have hidden secret messages within much of his artwork. Most scholars agree that even Da Vinci's most famous pieces—works like The Mona Lisa, The Last Supper, and Madonna of the Rocks—contain startling anomalies that all seem to be whispering the same cryptic message…a message that hints at a shocking historical secret which allegedly has been guarded since 1099 by a European secret society known as the Priory of Sion. In 1975, Paris's Bibliothèque Nationale discovered parchments known as Les Dossiers Secrets, identifying numerous members of the Priory of Sion, including Sir Isaac Newton, Victor Hugo, Botticelli, and Leonardo da Vinci. French President, Francois Mitterrand, is rumored to have been a member, although there exists no proof of this.

There exists a chapel in Great Britain that contains a ceiling from which hundreds of stone blocks protrude, jutting down to form a bizarre multi-faceted surface. Each block is carved with a symbol, seemingly at random, creating a cipher of unfathomable proportion. Modern cryptographers have never been able to break this code, and a generous reward is offered to anyone who can decipher the baffling message. In recent years, geological ultrasounds have revealed the startling presence of an enormous subterranean vault hidden beneath the chapel. This vault appears to have no entrance and no exit. To this day, the curators of the chapel have permitted no excavation.

The Vatican prelature known as Opus Dei is a deeply devout Catholic sect that has become controversial recently due to allegations of brainwashing, coercion, and a dangerous practice known as "corporal mortification." Opus Dei has recently completed construction of a $47 million, 133,000-square-foot American Headquarters at 243 Lexington Avenue in New York City.

The Louvre Museum in Paris is one of the longest buildings on earth. Walking around the entire perimeter of this horseshoe-shaped edifice is a three-mile journey. Even so, the Louvre's collection of art is so vast that only a fraction of its works can be displayed on the walls. Inside the galleries, a multitude of security cameras watch over visitors. The number of cameras is so great that a staff of several hundred wardens would be required to monitor all of them. In fact, most of the cameras are fake.

Da Vinci's original commission for his famous Madonna of the Rocks came from an organization known as the Confraternity of the Immaculate Conception, which needed a painting for the centerpiece of an altar triptych in their church of San Francesco Grand in Milan. The nuns gave Leonardo specific dimensions and a desired theme—the Virgin Mary, baby John The Baptist, Uriel, and Baby Jesus sheltering in a cave. Although Da Vinci did as they requested, when he delivered the work, the group reacted with horror. The painting contained several disturbing "un-Christian" anomalies, which seemed to convey a hidden message and alternative meaning. Da Vinci eventually mollified the confraternity by painting them a second version of Madonna of the Rocks, which now hangs in London's National Gallery under the name Virgin of the Rocks. Da Vinci's original hangs at the Louvre in Paris.