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Amazing images from largest underground structures of Hagia Sophia

Described as the "8th wonder of the world" by many people, Hagia Sophia's galleries, tunnels, cellars, and underground tomb structures bear witness to its majestic history.

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Amazing images from largest underground structures of Hagia Sophia
"The construction of Hagia Sophia, which has survived until today, started in 532 and was completed in 537," he said, adding that the main space in this building is covered with bricks on four arches supported by four piers.