As such an important symbol in art history, the altarpiece has long been highly sought after and widely coveted. Since 1432, when it was first installed at Saint Bavo Cathedral in what’s now Belgium, the Altarpiece has survived 13 crimes. Looted, burned and torn apart, it’s been through the hands of multiple armies, including those of Napoleon and the Nazis.

After World War II, the Monuments Men —a group set up by the Allied armies to protect cultural heritage from the Nazis—brought it back to its original home in Ghent, Belgium. One of the panels—“The Just Judges”—is still missing following its theft in 1934. Its absence remains one of the most intriguing riddles in art history.