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We'll take a closer look at some well-known paintings and reveal their amazing secrets hidden in plain sight for hundreds of years. Read on to hear music hidden in a 500-year-old picture, speculate on what a medieval UFO may have looked like, and see if you can find the self-portrait hidden inside a painting.

Do you fancy yourself as a puzzle solver? Here's your chance to try your hand at one of the internet's most difficult unsolved puzzles and join a mysterious top-secret club. Three puzzles were set, but one remains unsolved.