Question: What is the name of the painting stolen on March 19, 1990 for which a museum initially offered a $5 million reward for information leading towards its recovery?
Sentence (from "Isabella Stewart Gardner Museum theft"): Once inside, the men tied up the guards and, over the next hour, stole 13 works of art valued at $500 millionthe largest-value theft of private property in history.
Relevant evidence: No