The ancient city of Berlu Rigio in Italy. Built 2500 years ago, on the top of the hill, this ancient little village is located on a huge limestone in a steep valley, connected only by a long stone pedestrian bridge to the outside world, and from a distance looks like an aerial castle, hence called the “City of the Sky,” Much like the scene in the city of the sky, the spirit, the dream, the city has been abandoned for hundreds of years, the inspiration of a famous animated film "The City of the Empty" produced by Japanese animation master Miyazaki came from this castle. The beautiful Bailu Rigio is dying. In 2006, the World Heritage Foundation added White Lurge to its list of “100 most endangered sites”.