The long-running theory among Denverites is that if the rest of the country knew about the Mile High City’s 300 or so annual days of sunshine, resolute friendliness and relative affordability, there wouldn’t be anyone left to live in other major cities.įounded at the confluence of the South Platte River and Cherry Creek, Denver was an 1850s Colorado boomtown for ranchers and prospectors who struck silver and gold in the Rocky Mountains just 15 miles west.