The Denver Theory

Denver International Airport has some secrets. At least, that's what all the conspiracy theorists on the internet will tell you. Located roughly 20 miles from downtown Denver, the airport has dealt with its fair share of rumors since it was built to replace Stapleton International Airport in 1995. From the beginning, Coloradans have theorized about its secret tunnels, clues regarding secret societies, and horrifying harbingers of doom "hidden" in public artwork around the popular hub.

Through it all, airport officials have been perfectly willing to fuel these wild ideas about secret Illuminati bunkers, underground tunnels, and links to aliens in marketing campaigns. It's all been pretty tongue-in-cheek. At the airport (which is often referred to locally by the abbreviation "DIA" despite its official code of DEN), you may even see signs with giant lizards dressed in construction gear saying, "Apologies for the noise, it takes really big drills to get to the underworld" — but there are plenty of people out there who still take those rumors seriously.