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Mystery has surrounded the iconic structure for years, with historians debating who built it, when it was built and even whether there are secret tunnels beneath it.

And Matt Sibson, an ancient history and civilisations expert, believes two relics may be crucial in determining what lies below the structure.

The historian now runs a YouTube channel called Ancient Architects, “offering alternative interpretations and the most well-known ancient sites in the world”.

In his new video, Matt says that in Ancient Egyptian times, there were three "stelae” (stone slabs with depictions on them) located at the front of the Sphinx when it was first erected.

The first, the Dream Stela, was built erected by King Thutmose between 1479BC and 1425BC and remains at the site.

The second two – Stela B and Stela C – were created by Ramesses the Great more than 200 years later.

They were removed from the Sphinx and taken to The Louvre museum in Paris, France, in the 19th century but little has been spoken about them since.

The historian came across an image of the two stelae in explorer Howard Vyce’s 1837 book Operations Carried on at the Pyramids of Gizeh in 1837.

(Image: GETTY/DS)

Speaking to Daily Star Online, Matt revealed the interesting depictions seen in the image of one of them.

“There’s a Sphinx on the top of a platform, with Rameses the Great next to it and giving an offering,” he said.

“The Sphinx is sitting on top of what looks like a doorway.

“On the Dream Stele, there is also a doorway beneath the Sphinx which backs it up.”

Matt revealed how Howard claimed in his book that those exploring it at the time found a door.

(Image: ANCIENT ARCHITECTS / YOUTUBE) (Image: DS)

“Excavators found a doorway under the Sphinx, which could have pointed to a cavity underneath it,” he said.

But he added that Howard’s image only showed one of the stelae in detail.

“What does the other one show?” he asked.

“It needs to be re-analysed and brought back to life.

(Image: DS)

“It could shed more light on the doorway.”

Matt is convinced there is far more than meets the eye when it comes to the Great Sphinx, particularly beneath it.

“I think there is something underneath there, there are loads lots of tunnels under the Giza plateau,” he added.

Daily Star Online has contacted the Louvre for more information but is yet to hear back.