Come visit the travelers best friend at Hudson Books on the C concourse we have everything the help to coveys latest or game thrones what are waiting for come grab a book from the friendliest staff.
If you have time Google about the Denver airport and the conspiracy theories. Will help you pass the time .. and creep you out as you look around the airport.
Little frequent flyer secret - security into Terminal A is at least :15 faster than the main security access. You can walk over the skywalk to the terminal & catch the tram to B & C gates.
Security lines are hell on Earth on a Friday morning. Know how they say to arrive at the airport 2 hours ahead of your flight and you never do it? Do it. This massive airport is not to be effed with.
The airport shows aging after it opened late 90's? Can't remember when it opened. A lot of signage lights are out. Interestingly, United Club East lights seem to be out as if the UC East is closed.
If you have time before your flight leaves & the food in your terminal isn't too your liking, you can easily catch a tram to one of the other terminals for some other food without leaving security.