If you've never seen a Broncos or Colorado Rapids game, you are missing out on one of Denver's great experiences. Invesco Field is simply awe-inspiring and that is with or without a game going on. everything is large! Large and clean. Everything you see from the outside is reflected on the inside and then some! I believe they offer tours, and while I have never participated in one, I think it would be great fun. I have attended both Broncos and Rapids games there, as well as Invesco's Fourth of July Fireworks Extravaganza and they were all memorable experiences. The giant screens are amazing!
Drawbacks include crowds, parking and if you are afraid of heights, as I am, don't even venture into the 500-sections! It will make your head spin!