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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
Most of the underground spaces of Hagia Sophia were built for plumbing and ventilation, he said, adding that it is difficult to cross the tunnels due to narrow spaces.