The Paris Museum of Modern Art Heist

On the night of May 19-20, 2010, a single thief broke into the Musée d'Art Moderne in Paris through a window left unlocked for ventilation, and stole five paintings worth an estimated €500 million — works by Picasso, Matisse, Modigliani, Léger, and Braque. A security guard had noticed the broken padlock but did nothing. The suspect was arrested weeks later, but claimed he had panicked and destroyed the paintings. Only one small piece has been recovered.