The Denver Broncos are a professional football team that was founded in 1960 as part of the American Football League (AFL) and joined the National Football League (NFL) in 1970. Mile High Stadium was the team's home stadium from 1960 to 2001 and was known for its high altitude and loud crowd noise. In 2001, the Broncos moved to their current stadium, Sports Authority Field at Mile High, which is located next to the original Mile High Stadium.