At first glance, there's nothing dark in this ancient city; the sky is clear and blue and the Sun shines splendidly. But locals claim that this ancient city is haunted by ghosts and demons. This is Khara-Khoto "Black City" located in western Inner Mongolia, China. It was a Tangut city founded in 1032 AD. According to archeologists and historians, Khara-Khoto was the ancient city of Etzina, one of the places visited by Marco Polo during his Eastern voyages.