1. On September 23, 1913, the last spike was driven in the Pikes Peak Highway, which climbs to the summit of Pikes Peak in Colorado. The highway is one of the most scenic drives in the state, with stunning mountain views and hairpin turns.

2. September 23, 1989, marked the opening of the Great Divide Brewing Company in Denver, Colorado. It is one of the oldest microbreweries in the state and has won numerous awards for its craft beers.

3. In 1861, on September 23, the Colorado Territory was given the authority to form a state government. However, it wasn't until 1876 that Colorado became the 38th state in the United States.

4. September 23, 2010, was a historic day in Colorado, as the state's first medical marijuana dispensary opened to the public. This marked a major shift in the state's attitude towards marijuana, which has since been legalized for recreational use.

5. On September 23, 1846, John C. Frémont and his expedition passed through Colorado's South Park. Frémont would go on to become a major figure in the history of the American West, mapping many of the region's previously unexplored areas.