1. On September 24, 1911, the Washington State Capitol Building was dedicated in Olympia. The building, with its copper dome and neoclassical design, is considered one of the most significant architectural landmarks in the state.

2. In 1940, President Franklin D. Roosevelt visited Tacoma to inspect military defenses and equipment in preparation for World War II. This was one of many similar visits the president made to Washington state during the war.

3. On September 24, 1968, Seattle's Space Needle was officially designated a historic landmark by the city council. The iconic structure, built for the 1962 World's Fair, continues to attract visitors from around the world.

4. The first-ever Microsoft computer, the Altair 8800, was released on September 24, 1975. The computer, which could perform simple calculations and run simple programs, was a major milestone in the development of personal computing.

5. On September 24, 1984, the first large-scale public demonstration of the Macintosh computer took place in Seattle. Steve Jobs, co-founder of Apple, personally demonstrated the computer's revolutionary graphical user interface and mouse input. The Macintosh soon became one of the most popular personal computers of the 1980s and beyond.