Gisborne Airport, New Zealand

It might sound like an overstatement to some but this might be the craziest and most strangely dangerous airport in the world. Why? See, the Palmerston North–Gisborne railway line cuts straight across the airport’s main runway. Yep, you read that correctly: the air traffic controllers must coordinate takeoffs and landings with train arrivals among other things and even though the rail line has recently closed because of storm damage, the airport is still open and functional but it only carries freight not people since 2001.