1. On January 15, 1908, the first flight between Seattle and Victoria, British Columbia was completed by pioneer aviator Charles Hamilton.

2. In 1941, the newly constructed Pentagon building in Arlington, Virginia, was dedicated on January 15. The massive complex serves as headquarters for the United States Department of Defense.

3. On January 15, 1965, former U.S. President Dwight D. Eisenhower was inaugurated as the first Chancellor of the newly established University of Washington Medical Center.

4. The tallest building in Seattle, the Columbia Center, held its grand opening on January 15, 1985. Standing at over 934 feet tall, it remained the tallest building in the western United States until 2017 when the Wilshire Grand Center in Los Angeles surpassed it.

5. On January 15, 1992, the Washington State Grizzlies men's basketball team pulled off one of the biggest upsets in college basketball history, defeating the highly favored UCLA Bruins in a game that became known as "The Game of the Century." The Grizzlies entered the game as 24-point underdogs but managed to win in double overtime by a score of 77-74.