Istanbul Shore Excursion: Istanbul in One Day Sightseeing Tour. This sightseeing tour of Istanbul provides the perfect introduction to the fabled city that spans Asia and Europe. On this shore excursion you will see how old meets new when you visit Istanbul's four "must-see" historic sites. Highlights: Full-day eight-hour tour of Istanbul and its four main attractions. Superb Blue Mosque. Historic Hagia Sophia and its Byzantine mosaics. Ottoman architecture and museums of Topkapi Palace. Shopping in the Grand Bazaar. Lunch included. English-speaking guide. Covered by Viator’s worry-free policy: guaranteed on time return to your ship. Book with us and Save 10% Off Istanbul Shore Excursion: Istanbul in One Day Sightseeing Tour.