Unidentified thieves stole thirteen works of art collectively valued at $500 million from the Isabella Stewart Gardner Museum (pictured) in Boston, Massachusetts.

In the early hours of March 18, 1990, 13 works of art were stolen from the Isabella Stewart Gardner Museum in Boston. Security guards admitted two men posing as policemen responding to a disturbance call, and the thieves bound the guards and looted the museum over the next hour. The case is unsolved; no arrests have been made, and no works have been recovered. The stolen works have been valued at hundreds of millions of dollars by the FBI and art dealers. The museum offers a $10 million reward for information leading to the art's recovery, the largest bounty ever offered by a private institution.

The Isabella Stewart Gardner Museum is an art museum in Boston, Massachusetts, which houses significant examples of European, Asian, and American art. Its collection includes paintings, sculpture, tapestries, and decorative arts. It was founded by Isabella Stewart Gardner, whose will called for her art collection to be permanently exhibited "for the education and enjoyment of the public forever."