Hidden Portrait Found Under 'Mona Lisa' Painting

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11. The technology they are using for this exploration is amazing

The Smithsonian Channel program The DaVinci Detective details one man's investigation of some of the paintings of DaVinci and the methods he developed to discover new information about them.

There are several clips from the program on this page:

One of the only real-life characters in Dan Brown's bestseller "The Da Vinci Code," Maurizio Seracini is a controversial scientist on the trail of two fascinating unsolved mysteries. For thirty years, he has searched for a lost Leonardo Da Vinci mural unseen since the 1540s. Along the way, he has uncovered a series of magnificent Da Vinci drawings that were hidden for years. Follow along with the Smithsonian Channel as all of the clues fall into place.
http://www.smithsonianchannel.com/shows/the-da-vinci-detective/0/137976

Another clip from the program:

National Geographic also made a documentary about Maurizio Seracini: