Archaeologists have uncovered many unique pieces of art and tools over the years that help us understand human history.
But some people believe they could be telling us more about life beyond Earth.
It's well documented that many believe the Pyramids and Stonehenge were made extraterrestrials but early artwork from the Mayans and Aztecs to objects found high in the mountains are also seen to be early representations of life in space.
These are the most compelling cases from around the world.
The Shigir Idol
The 12,500-year-old Shigir Idol has been compared to 'alien heads' by a number of those interested in the paranormal.
Radio host, Brady DeAngelo or Brady in the morning posted to Facebook saying: "Looks like an Alien's head to me. So many alien-looking drawings and artefacts in our distant past. It's crazy.
"I'm not saying our ancestors may have been aliens and they took their DNA and fused it with a monkey's DNA to create humans. I'm not saying that. At all. Not yet."
The perfectly preserved wooden sculpture is believed to be proof of the vast changes in climate since it was made.
Coso Artefact
The Coso Artefact is a stone rock-like object that was found in the mountains of Eastern California.
When put under an X-Ray showed the metal pin, with a spring or helix at one end. The other half of the object showed metal covering the porcelain-like cylinder.
People have speculated that the object, which is now on display at the Pacific Science Center, was an electronic device left on earth by alien visitors over 500,00 years ago.
Mayan UFO Carvings
12,500-year-old wooden sculpture is a 'unique and unparalleled find' in human history
A Mexican documentary released in 2012 claimed that the ancient Mayans had contact with alien visitors who left behind evidence of their existence.
The 'evidence' made up of 'codices, artefacts and significant documents' is said to have proved Mayan and extraterrestrial contact hat was released by the country's government.
Stone carvings created by the ancient civilisation are said to resemble UFOs.
The minister of tourism for the Mexican state of Campeche, Luis Augusto García Rosado also spoke of "landing pads in the jungle that are 3,000 years old".
Aztec Alien Sculptures
The Aztecs came long after the Mayan civilisation – and it is believed that some of their sculptures replicate alien life.
Photos of the artefacts show the planet Saturn pictured with what can be interpreted as alien heads and UFOs.
In 2019, Stephen Quayle discussed Aztec artefacts on the Coast to Coast radio show where he said: "This is the first time to my knowledge, that I have ever seen Saturn depicted with aliens and classic UFOs together, especially on a 500-year-old Aztec artefact."
Sanxingdui site Treasures
3,000-year-old gold treasures discovered in China 'could rewrite human history'
The 3,000-year-old treasures recently discovered in Guangyuan, Sichuan is said to have reignited debates on the existence of aliens.
Despite scientists saying the artefacts could change all we know about human history, others believe the mask resembles a common image of an alien.
This is due to its wide-eyes and a deep nose, similar to earlier discoveries of bronze human statues, fueling speculation of alien inhabitants because the features look "foreign".
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