On this date in 1990, the Isabella Stewart Gardner Museum in Boston, MA was robbed. It was just after midnight when two men dressed as police officers appeared at the museum’s door, claiming they had received a report about a disturbance at the museum. One of the two guards on duty that night let them in. Minutes later the guards were overpowered, bound with duct tape, and stashed in separate parts of the museum’s basement. The two bogus cops went to work stealing various items, including works by Rembrandt, Degas, and Manet. The estimated value of their haul: over $300 million. It was the largest art heist in US history. To date, the case remains unsolved, and none of the stolen works of art have been recovered.
FBI – Art Theft program
Boston.com – Secrets behind the largest art theft in history