If you thought the worst of your flying fears was heavy turbulence (or — gasp! — a chatty seatmate), try landing on a notoriously terrifying airport runway where even the pilots hold their breaths. Factors like short lengths or unfortunate locations have produced some scream-worthy airstrips that are known to jangle nerves upon descent. Some are scary enough that travelers think twice when making their vacation plans (though thrill-seekers crave the adrenaline rush). So say a little prayer at these eight international airports known for extreme runways.