1. In 1873, the first Kentucky Derby winner, Aristides, was foaled in Franklin, Pennsylvania. Aristides went on to win the inaugural Kentucky Derby in 1875.

2. On May 20, 1909, Wilbur Wright set a world record by staying in the air for an hour and 31 minutes in College Park, Pennsylvania. This was the longest flight ever made by a Wright brothers airplane.

3. In 1927, Charles Lindbergh received a ticker-tape parade in Philadelphia after completing his historic nonstop solo flight across the Atlantic Ocean.

4. The Allegheny Observatory in Pittsburgh was dedicated on May 20, 1912. The observatory is renowned for its research on stars and galaxies.

5. Harrisburg, Pennsylvania, was home to the first World Series of Professional Football on May 20, 1933. The tournament was won by the New York Giants who beat the Chicago Bears in the championship game.