The claim that there is a 'vast city' beneath the pyramids of Giza has become the center of some heated debate.
A recent study has reportedly discovered evidence of structures stretching thousands of feet beneath the desert sands.
In September 1971, a mysterious glowing green object in the sky over a UK city caused quite a commotion.
This image shows a secretive subterranean complex that was abandoned several decades ago.
The rate at which we can extend our own lifespan could soon exceed the speed at which we actually age.
Initially dismissed as a stunt, the incident's authenticity was later confirmed by both of the robots' manufacturers.
The unidentified object quickly zoomed past the frame during filming of a news report over Manhattan.
Clusters of strange egg-like objects were recently hauled out of the water by volunteers in the city of Utrecht.
The ruins of an ancient city in southern Mexico have yielded evidence of long-lost underground tunnels.
The surprisingly clear image, which was captured over the city of Xiamen, has been circulating social media in recent days.
The clip shows a strange object that remained stationary over the Brazilian city of Curitiba.
Archaeologists have discovered an extensive series of tombs and burials in the ancient Egyptian city of Aswan.
Tiny little doors, sign posts and decorations have been found in and around the New York City neighborhood.
A veteran crime scene recreation expert has weighed in on the authenticity of the controversial video.
It would have been one of the most revolutionary and ambitious constructions on Earth... so where is it ?
The SpaceX CEO has some ambitious plans to build a thriving city on the Red Planet within as little as 20 years.
The object, which resembled a metallic disc, quickly zipped past the window at considerable speed.
Scientists have spent decades attempting to locate the long-lost medieval Yorkshire city of Ravenser Odd.
The mummified humanoid entity was allegedly discovered curled up in a mountain mine somewhere in Peru.
The footage, which sparked some intense debate online over its authenticity, appears to be the real deal.