Explore the breathtaking Hagia Sophia, a masterpiece of Byzantine architecture originally built as a cathedral and later a mosque, now a museum. It's open 9:00 am to 7:00 pm.
A short walk away is the Blue Mosque, renowned for its stunning blue Iznik tiles and six minarets. Visit hours are generally 9:00 am to 7:00 pm, closed temporarily during prayer times.