The document discusses famous and special stamps. It begins by describing the most famous stamp, the Treskilling Yellow from Sweden, which sold for $2 million. It then discusses what can make a stamp special, such as size, rarity, history, or errors in printing. The document provides examples of expensive stamps that have sold for high prices, including the Treskilling Yellow and stamps from Mauritius and British Guiana. It also notes some unusual stamps like those printed upside-down or abnormally large stamps.