A giant mirage of a city appeared over eastern China's Hongze Lake at around 3:40 on Sunday (August 4).

The mysterious clip, filmed by a photographer named Chen Kai, shows a mirage of ancient Chinese buildings floating above the Hongze Lake.

According to reports, Chen was about to take some pictures of the sunset after the rain and happened to see the mirage city and filmed it.

The curator of Hongze lake museum said the rare phenomenon happened at Hongze lake in the 1950s or 60s.

The mirage lasted for around half an hour, reports said.