The Hidden Secret

The truths behind 10 of the world's great wonders.

Ever visit an incredible site in some exotic land and wonder how it was built? The notice board just lists a few meaningless dates, or a guide rattles off a bunch of jargon-packed phrases, but you want the real dirt. Here we reveal the ingenious engineering behind 10 of the world's most epic structures – and the little-known facts that lie hidden in their depths.

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