• Benjamin Franklin is on the $100 bill. President Woodrow Wilson appears on the $100,000 bill. The Bureau of Engraving and Printing printed 42,000 of them from December 1934 to January 1935.

• The “Upside-Down Jenny” is a 1918 US postage stamp featuring a picture of an airplane. On one hundred of the stamps, the plane was accidentally printed upside down. This error has made them famous and prized by collectors. If you find one, it may be worth $500,000 or more.

• Action Comics #1 is the most valuable comic book in history. It was printed in 1938 and it includes the first appearance of Superman. A copy of it sold for $3,200,000.

• Honus Wagner, “The Flying Dutchman,” played baseball from 1897 to 1917. He is on the world’s rarest baseball card. Only 57 of them are known to exist. If you find one, it could be worth more than $5,000,000.

• The full value of the New York Yankees, including the baseball stadium and all the players’ contracts, is about $2.5 billion.