1. On August 22, 1987, the Washington State Centennial Train rolled into Spokane as part of celebrations for the state's 100th birthday. The train carried exhibits showcasing the state's history and culture, and made stops in cities across Washington.

2. August 22, 1950, marked the grand opening of the first major shopping center in Washington state, Northgate Mall. The mall, located in Seattle, quickly became a popular shopping and entertainment destination in the region.

3. On August 22, 1889, Seattle's Great Fire destroyed much of the city's downtown area, including the entire business district. The fire burned for over 12 hours and led to several deaths and millions of dollars in damage.

4. August 22, 1926, saw the construction of Stonehenge Memorial in Maryhill, Washington. The memorial, built by millionaire entrepreneur Samuel Hill, is a replica of the famous Stonehenge in England and serves as a tribute to fallen soldiers from World War I.

5. August 22, 1944, marked the start of the Hanford Site's nuclear production operations in Washington. The site, located near Richland, was a major contributor to the Manhattan Project and produced plutonium for atomic bombs used by the United States in World War II. The site is now a Superfund cleanup site due to the environmental damage caused by its operations.