1. On September 16, 1961, the historic Stanley Hotel in Estes Park was designated a National Historic Landmark. Famous for inspiring Stephen King's novel "The Shining," the hotel boasts stunning architecture and scenic views of the surrounding Rocky Mountains.

2. September 16, 1861 saw the Battle of Dry Wood Creek take place in Missouri, which was significant for Colorado as it was one of the first battles of the Civil War to involve Colorado troops. The 1st Colorado Infantry Regiment successfully fought against pro-Confederate guerrilla forces.

3. In 1983, on September 16, the Colorado Rockies became an official Major League Baseball team, beginning their inaugural season in 1993. Despite early struggles, the team has since gained a strong following and has made several playoff appearances.

4. September 16, 1910 marked the creation of Rocky Mountain National Park through an Act of Congress. The park covers a vast area of over 265,000 acres and is home to diverse wildlife, including elk, moose, and black bears, as well as stunning natural features such as mountains, forests, and lakes.

5. On September 16, 1905, the Colorado State Fairgrounds in Pueblo opened its doors for the first time. The fairgrounds have since become a beloved venue for local events, including the annual Colorado State Fair, which attracts thousands of visitors each year with its live music, carnival rides, and agricultural exhibits.