To say the least, the layout at DIA is unique and complex, with five seperate runways in all directions spread out all over the field. The terminal structure is much like Atlanta, with conscourses that are connected only by underground train. Lufthansa, Air Canada, Korean, Mexicana, and British Airways give the airport a bit of international flavor, and while 777's, DC-10's and 767's are relatively common, most of the traffic is made up of 737's, 727's, commuter props and BAe 146's.

OUTDOORS:
-East Terminal parking garage: From the top of this parking garage, you can watch the action on 17/35 as well as action on the distant 8/26.
-West Terminal parking garage: Action on 7/25 is visible from this garage, albeit some distance away.

INDOORS:
-Concourse C, Gate C48: Approaches on the 17's and departures on the 35's, as well as action on the very distant Runway 8 (where a lot of the heavy action takes place), are nicely visible from this spot.
-Eastern end of Concourse A: Takeoffs on the 17's are great to watch from here, and arrivals on the 35's are nice as well.
-Jeppsen Terminal/Concourse A bridge: Talk about unique! This window-clad bridge sits high over an active taxiway and regularly sees aircraft taxi beneath it. Throughout the day you can stand on the bridge and watch the aircraft pass right under you, especially Frontier 737's, which are based in Terminal A.

PRE-9/11 SECURITY REPORT:
-Security problems are not a major concern in Denver. I spent a few hours atop the East Terminal parking garage and never had any problem with security. Security is very efficient indoors, with a central security screening in the Jeppsen Terminal. Only having to go through security once in the day makes for a much more enjoyable indoor experience.