Tour Old City
Enlist a tour guide, like Unison Turkey, to show you around the oldest area of Istanbul. Don’t miss the 1,500-year-old Hagia Sophia, which was originally built as a basilica and spent time as a mosque before it was transformed into a museum. The nearly destroyed mosaics are as impressive as the structure’s enormous domes, making the site a masterpiece of Byzantine architecture. The sprawling Topkapi Palace and the Blue Mosque are within walking distance of the Hagia Sophia.
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