ritish and other researchers have succeeded in uncovering the long-lost secrets of one of the world's most important buildings.
More than a decade of intensive investigations have revealed the original design and subterranean mysteries of Europe's largest ancient landmark – the former cathedral of Hagia Sophia in Istanbul, which for almost a thousand years was the largest conventional building in the world.
The research has, for the first time, revealed the layout of the original sixth century cathedral complex – and the existence of more than a kilometre of long-lost tunnels and subterranean chambers underneath the vast building.
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