The world's strangest, weirdest and scariest airports From the Hebrides to the Himalayas, we reveal some of the strangest and scariest airports around the world. Denver International, USA Denver International Airport has found itself under intense scrutiny from conspiracy theorists since it opened in 1995. Philip Schneider, a structural engineer turned whistle-blower who died in mysterious circumstances in 1996, claimed that beneath the airport lies a vast underground facility, which then prompted suggestions that the airport is actually hiding a secret military base or even a concentration camp. And why, ask conspiracy theorists, do the runways form the shape of a swastika? By Oliver Smith