Denver, Colorado, earned its nickname because its official elevation is exactly 5,280 feet (1,609 meters) above sea level—one mile. The benchmark is marked on the west steps of the Colorado State Capitol.
Situated at the transition between the Great Plains and the Rocky Mountains, Denver's high elevation shapes its climate (300+ sunny days, low humidity, rapid weather changes), culture (outdoor lifestyle), and even sports (balls fly farther at Coors Field).
Many cities are higher (e.g., Leadville, CO at 10,152 ft), but Denver's combination of major-city status, precise mile elevation, and Rocky Mountain backdrop made the moniker stick globally.