1. On June 22, 1895, the first public library in Phoenix, Arizona was established. The library was located in a small room in the Fleming Building and had just over 1,000 volumes. Today, the Phoenix Public Library system has 17 branches and a collection of over 1.5 million books.

2. In 1937, a magnitude 6.0 earthquake struck near the town of Globe, Arizona on June 22. The quake caused significant damage to buildings and homes in Globe and the surrounding area.

3. On June 22, 1973, two gunmen entered the Hiway House Motel in Tucson, Arizona and took nine hostages. The gunmen demanded $2 million in ransom and the release of two prisoners from state prison. After a 10-hour standoff, the hostages were released unharmed and the gunmen were arrested.

4. Construction on the Hoover Dam, which would become a major source of hydroelectric power for Arizona, began on June 22, 1931. The dam, which sits on the Arizona-Nevada border, would take five years to complete and remain a marvel of engineering to this day.

5. On June 22, 2002, the Arizona Diamondbacks set a team record by scoring 14 runs in a single inning. The Diamondbacks achieved the feat against the Colorado Rockies in a game at Coors Field in Denver, Colorado.