Denver International Airport located at 8500 Pena Boulevard, Denver, Colorado U.S.A., 80249-6340 is open 24-hours-a-day, seven days a week. Capacity, capacity, capacity. Whether it is airfield, passenger or cargo facilities, Denver International Airport has room to grow. Situated on 34,000 acres or 53 square miles, DIA is one of the largest airports in the world.Denver International Airport has three midfield concourses, spaced far apart. Concourse A is accessible via a pedestrian bridge directly from the terminal building, as well as via the underground train system that services all three concourses. For access to Concourses B and C, passengers must utilize the underground train system. The concourses and main terminal are laid out similar to Atlanta's airport, except that DEN has no "T" gates directly attached to the terminal and departures are on a different level of the terminal than arrivals.