Though they serve as transient spaces, meant to shuttle passengers with as little fuss as possible, airports have become unlikely sites of conspiracies and lore. If you arrive at the Savannah/Hilton Head International Airport right after sundown, you allegedly can glimpse the ghosts of a couple who once owned the land the airfield stands on. Within the subterranean tunnels of the Denver International Airport supposedly lies an apocalypse bunker for the country’s elite, a nearly 90-mile tunnel to the North American Aerospace Defense Command outside Colorado Springs, and a lair of lizard people. And at Houston’s George Bush Intercontinental Airport, on a floor under the ticketing counters, runs a rail link built by Disney. Unlike the other stories, the last one is true.I first came…