Graffiti 
Art Heist
One night in 1990, only two watchmen were responsible for guarding hundreds of millions of dollars of art at the Gardner Museum. One could say the job was pretty uneventful, even boring.
But on St. Patrick’s Day weekend in 1990, the watchmen’s usual routine was dramatically changed by two thieves. Two men who were dressed as Boston Police officers rang the doorbell. Going against rules, a watchman let them into the museum. Within minutes he and the other watchman were tied up by the thieves, who had free reign over the museum.
On this night, these two thieves would pull off the greatest art heist in history. It is considered by many the biggest property theft ever. By the time the burglars left the museum, over 500 million dollars of art was gone by them.
More than two decades later, visitors to the museum can still see the empty frames of the stolen paintings that hang on the walls. They are reminders of a spectacular crime.
To this day, the art work has never been found, the thieves never caught. And more puzzling is the fact that none of the 13 works of art have ever been sold by anyone as far as investigators can tell.
Why would these criminals steal valuable works of art if they weren’t going to make any money off of them? Why they did it is a mystery that is still unanswered by the FBI.
And who were these thieves? Now on the 23rd anniversary of the crime, the FBI says they know who did it. However, the 20 year statute of limitation has expired, which means the thieves can no longer be prosecuted for their crime by the government.
Now, 23 years later, the museum just wants its art back. A big announcement was made by museum officials saying that they know who stole the art. They want the private collector, thieves, or person storing them to come forward and make a deal. Museum officials are hoping that the art will voluntarily be surrendered.
"Greatest Art Heist in History" Link