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National Geographic: Ancient Megastructures - Istanbul's Hagia Sophia: Discover how the church of Hagia Sophia in Istanbul, rebuilt by the Roman Emperor Justinian, has survived 1,500 years of turbulent history.

Watch the full National Geographic: Ancient Megastructures - Istanbul's Hagia Sophia movie online at no cost in high-definition (HD) quality. No downloads needed—simply click to play and experience the excitement with English subtitles included for your convenience.