This $2 bill belonged to Robert Joseph Gschaar, who was working on the 92nd floor of the South Tower on September 11th. He had made a phone call to his wife after the initial attack, telling her that he would be on his way home soon. Unfortunately, he did not make it. This $2 bill was found in his wallet, along with his wedding ring, about a year later.
To Learn More: history.com/news/9-11
Source: National Museum of American History, Smithsonian Institution
Source: History.com