The nearby limestone mountain, Mt.

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This gorge wriggles through the Picos for 11km, with limestone cliffs and mountain slopes rising up to 1, 500m overhead.

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It is also a mountain rich in limestone and has for decades been gouged out by cement companies.

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The Great Pyramid, a 146-metre-high mountain of stone, was created by arranging 2.3 million limestone blocks, each about 2.5 tonnes, with astonishing accuracy.

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