The cache is not at the listed coordinates, but is nearby. This is the third in a series of mystery caches devoted to AI. This puzzle is most easily solved without programming, although it can also be solved with programming. Mail AI.in.Cambridge@gmail.com if you need help.
Geocachers should have a natural affinity for steganography, the practice of hiding data in plain sight. Steganography isn't really AI–this cache was originally going to have a machine vision theme–but once I had the idea for the puzzle I couldn't stop myself.
There's no quiz this time. Everything you need to solve the cache is in the two images below. The first one is an image of the Mona Lisa taken from Wikipedia. The second image is almost the same, but has the cache coordinates hidden inside. You will not be able to see the coordinates with the naked eye, and zooming in won't help.
The coordinates will take you close to a location with an important place in the history of images.
Original enigmatic Mona:
New Mona with extra enigma:
