City in the sky appears in China: Residents baffled (video)

Residents of the city of Foshan in China were baffled recently when a large apparition of a towering city appeared to be floating in the sky.

Local media reported on the strange occurence, although weather experts believe it's nothing more than a mirage reflecting the city below.

See also: Was a 'mirage' to blame for the sinking of the Titanic?

However, conspiracy theorists refute the claim, saying there might be something more serious afoot, such as a test of NASA's Blue Beam, which is believed to allow them to project holograms in the sky.

Some say this technology could be used to simulate an alien invasion, or even the second coming of Christ.

See also: Video: Amazing mirage of 'ghost city' appears over river in China

A similar siting was reported in 2011 in east China, where residents saw a city sitting atop a thin layer of mist after a rainy day.

Conspiracy theorists also claim that this could be Project Blue Beam tests, or even the use of HAARP, a US government project that conspiracists theorise could be used to create floods, hurricanes or other catastrophic events.

Even Cern has been blamed. This is a large particle accelerator located in Europe that some critics believe can open a door to parallel dimensions.

Those critical of the video claim that it could well be fake, and that effects like this can be achieved using a home computer and special software.

Whether optical illusion, parallel dimension or a real floating city, there's no doubt that the siting is strange and requires further study to discover what it really is.