In what could drive conspiracy theorists crazy, thousands of people from two separate locations in China reportedly saw a huge "alien floating city" in the skies.

Some of the onlookers reportedly took videos of the "floating city" appearing among the clouds and posted them on YouTube.

According to a report by Express, Chinese television stations claimed that thousands of people from two regions of China reportedly saw a huge city in the skies on separate occasions. It was first spotted at Foshan in Guangdong province of China before appearing in the skies over Jiangxi province, China.

Paranormal Crucible even uploaded a video footage of the said "floating city" on YouTube with the caption "Mysterious City Appears In Sky Above China." 

"The footage which was recorded by a local resident appears to show a huge city floating in the clouds," reads the description of the video. "The apparition, which was witnessed by hundreds of shocked local residents, only lasted a few minutes before completely disappearing."

However, experts think that the phenomena could be a mirage. Jill Coleman, an atmospheric scientist at Ball State University in Muncie, Indiana, thinks that it is a fata morgana. "[But,] if it is real, it's called a superior mirage, which just means it's an upward projecting mirage," Jill Coleman told National Geographic.

She went on to say that temperature inversions seemed to be going on in Jiangxi and Foshan regions when the video was taken and that the video appeared to be real as "some of the buildings in the city below the clouds look similar to what shows up in the sky". 

On the other hand, Peggy LeMone, an atmospheric scientist at the University Corporation for Atmospheric Research in Boulder, told the same website that "It (scene) looks almost too good."