Art Source International has amassed a collection of authentic images brilliantly highlighting and detailing the city of Denver, Colorado. The city is the capital of the state and the most populous. Denver is nicknamed the Mile High City because its official elevation is exactly one mile (5280 feet or 1609.344 meters) above sea level. The city was founded on November 22, 1858. Art Source International historic photographs can be ordered framed or without a frame.