The Ten Thousand Dollar Bill is a high-denomination currency note that was issued by the United States in 1928 and 1934. It features a portrait of Salmon P. Chase, who served as the Secretary of the Treasury during the Civil War. Although it was used primarily for transactions between banks, it was never circulated among the general public. The bill was officially discontinued in 1969, and it is now considered a collector's item. Due to its rarity, the Ten Thousand Dollar Bill can fetch a high price at auctions, often valued well above its face value.