Story highlights Researchers find evidence of 30-meter-long space hidden within pyramid's walls

This could mark the first discovery of a major space inside the ancient structure since the 19th century

(CNN) Mystery is no stranger to the Great Pyramid of Giza. For centuries, scientists and archaeologists have probed inside the largest and oldest of Egypt's famed pyramids.

But until now none had stumbled upon a 30-meter-long space hidden within its limestone and granite walls.

An international group of scientists has used modern technology to visualize the inside of the pyramid, according to an article published Thursday in the journal Nature

Researchers hope the discovery will help them understand more fully how the massive pyramid was built.

The Great Pyramid contains three previously discovered rooms: the King's chamber, a smaller Queen's chamber and a passageway called the Grand Gallery. But this marks the first discovery of a major space inside the ancient structure since the 19th century, the journal says.

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