1. On August 25, 1916, President Woodrow Wilson signed into law the National Park Service Organic Act, which established the National Park Service. This paved the way for the creation of some of Arizona's most iconic national parks, including the Grand Canyon and Petrified Forest.

2. August 25, 1930, marked the completion of Hoover Dam. The dam, which spans the Colorado River between Arizona and Nevada, provides hydroelectric power to millions of people and famously created Lake Mead, the largest reservoir in the United States.

3. In 1972, on August 25, the Arizona Diamondbacks played their first-ever game as a professional baseball team. They faced off against the San Diego Padres at Jack Murphy Stadium and won 4-3.

4. The Phoenix Zoological Society, now known as the Phoenix Zoo, was founded on August 25, 1962. The zoo has since become one of the largest non-profit zoos in the country and boasts over 3,000 animals across 125 acres.

5. On August 25, 1999, the town of Fountain Hills, Arizona, set a new world record for the tallest fountain. The fountain, which shoots water up to 562 feet in the air, can be seen from 20 miles away and draws thousands of visitors every year.