Atlético Nacional is a professional football club based in Medellín, Colombia. Founded in 1947, the team is one of the most successful in Colombian football history, having won numerous national championships and international titles, including the prestigious Copa Libertadores. The club's colors are green and white, and they play their home matches at the Estadio Atanasio Girardot, which has a capacity of over 40,000 spectators. Atlético Nacional has a passionate fan base and is known for its strong rivalries, particularly with Independiente Medellín, their local rivals.