The Concert (Vermeer)

Still missing since 1990. Vermeer's painting was one of 13 works taken from the Isabella Stewart Gardner Museum in Boston in the early hours of March 18, 1990, after guards admitted two men posing as police officers. The robbery lasted 81 minutes, and the thieves removed this canvas from its frame rather than cutting it. It is thought to be the most valuable unrecovered painting in the world. The museum offers a $10 million reward for information leading to the recovery of the works, and the case remains unsolved.