Istanbul Small-Group Walking Tour: Hagia Sophia, Blue Mosque, Topkapi Palace and Grand Bazaar. See all the top Istanbul attractions in one day on this small-group walking tour, led by an expert local guide. Focusing on the Sultanahmet area of this east-meets-west city, your tour visits incredible sites like the UNESCO World Heritage-listed Hagia Sophia Museum and the Blue Mosque. Step back in time to a world of sultans and harems in Topkapi Palace, admire Hagia Irene’s Byzantine architecture, and then watch local artists making handicrafts in the Grand Bazaar. Book Now and Save 10% Off Istanbul Small-Group Walking Tour: Hagia Sophia, Blue Mosque, Topkapi Palace and Grand Bazaar.