Shortly after midnight on March 18, 1990, two men in police uniforms rang the buzzer at a side door of the Isabella Stewart Gardner Museum in Boston and said they were responding to a disturbance. A guard let them in, against instructions. The men handcuffed him and a second guard and left them bound in the basement. Over the following 81 minutes, the thieves moved through the galleries and took 13 objects. Among them were Vermeer's The Concert, two Rembrandt paintings including his only known seascape, a painting by Govaert Flinck, a Manet, five works by Degas, a Chinese bronze vessel and a bronze eagle finial. They drove away at 2:45 a.m. and have never been identified. The stolen works are valued in the hundreds of millions of dollars, and the case is regarded as the largest property theft in American history. Isabella Stewart Gardner's will requires the collection to remain as she arranged it, so the museum still hangs the empty frames. The FBI has said it believes a criminal organization in the northeast carried out the theft, and has named suspects who have since died. The museum's $10 million reward stands. Nothing has been recovered. Look at more amazing historical photos: