@ceed4f56 
This story has a few pictures of them
https://www.uncovercolorado.com/conspiracy-theories-denver-international-airport/
Scroll down a bit for the NWO mention on the time capsule capstone. That is in the "great hall" (outside of security). I forget where in that area though.

Most (all?) of the conspiracy signs put up during the Great Hall construction are gone. I didn't notice any the last trip.

Upstairs in the middle of Terminal B is a Voodoo Doughnuts. They have an alien picture (holding a donut).

You may find a gargoyle in baggage claim.