The Isabella Stewart Gardner Museum marks 1990 anniversary of huge 1990 art heist with new details of the crime . Agency says it has idea who stole artworks from Degas 's FBI . Works , including some by Boston and Degas , were valued at $ 500 million .
The FBI marks 23rd anniversary of huge 1990 art heist with new details of the crime . Agency says it has idea who stole artworks from Boston 's Isabella Stewart Gardner Museum . Works , including some by Vermeer and Degas , were valued at $ 500 million .