Now if you're looking for a really meaty hunk of conspiracy fodder, get your tin-foil hats around this :
With apocalyptic murals, a terrifying giant horse statue and curiously laid-out runways, Denver International Airport has been the subject of many conspiracy theories since it opened in 1995...
...Visitors are greeted by a massive statue of a horse rearing on its hind legs with glowing red eyes. To add to the creepiness, the statue - titled Blue Mustang - killed its sculptor Luis Jimenez in 2006, when it fell on him and severed an artery in his leg.
Inside the terminal, the unsettling iconography continues. A gargoyle pops out of a suitcase at baggage claim and a mysterious plaque states that the airport was paid for by the "New World Airport Commission" - which doesn't exist...
...But strange murals by Leo Tanguma, which have since been removed, generated much of the interest from conspiracy theorists.
The paintings show a figure resembling a Nazi Stormtrooper killing a dove, and distraught children standing over extinct animals while a city burns in the background.
Another painting shows children handing weapons to a boy in lederhosen, who destroys them with a giant hammer.