Residents in China were baffled to discover a giant ghost city towered across the horizon along the Xin'an river in Huanshan City in East China. The apparition appeared earlier this June 2011 on the 16th after heavy rainfall and humid conditions along the river.
Experts who had visited the city were stunned to see that there were actually no buildings in that area where the ghost city was spotted. It is believed that this happened due to the formation of mirage- an illusion caused when moisture in air became warmer than the temperature of water below.
Although mirages had previously occurred occasionally, this was the clearest of all ever recorded. Some amazed residents even suggested that it could have been a vortex to a lost civilization.
http://www.youtube.com/watch?v=dsMmef04qGs&feature=related You can click on the link to have an access of the original video footage of the mirage.
