Make the most of your time in Istanbul on a full-day tour of the city's must-see historical places. Start the day at Hippodrome Square, where you can spot the distinctive tiles of the Blue Mosque. Next, explore Byzantine history in the Hagia Sophia, then follow in the footsteps of powerful sultans and generals at Topkapi Palace. Finally, finish the tour in the vibrant Grand Bazaar, where you can shop for souvenirs.