Begin your tour of the Sultanahmet district, the heart of old Istanbul, at Hagia Sophia. Built by the Emperor Justinian in the early 6th century A.D. and designed by Anthemius of Tralles and Isodore of Miletus, the church is one of the marvels of world architecture. Converted into a mosque in 1453, it is now a museum. Its massive dome still dominates the skyline of old Istanbul. It is also famed for its mosaics, including glittering portraits of emperors and empresses and a poignant Virgin and Child. Next, you will visit the Blue Mosque which takes its name from the exquisite tiles adorning its interior. Built by Sultan Ahmet I in the early 17th century and designed by a pupil of Sinan, the greatest of Ottoman architects, it is the only imperial mosque with six minarets. Its courtyard is especially grand. The Hippodrome, the stadium of ancient Byzantium, held 100,000 spectators and featured objects from all corners of the empire. Of these, an Egyptian obelisk and a bronze sculpture of three entwined serpents from Delphi survive. Brief Handicrafts Presentation & Lecture (Optional Attendance) next to the Grand Bazaar. Free time to explore Grand Bazaar on your own. 1 hour visit, Meeting back and drive to Lunch. The Grand Bazaar was the commercial heart of the old city and its 4,000 shops are full of treasures including carpets and kilims, silks, jewelry, ceramics, icons and leather goods. Wandering through the Grand Bazaar, indulge in some shopping, Note: Grand Bazaar is closed on Sundays. On Sundays we visit Nuruosmaniye Street around Grand Bazaar since Grand Bazaar is closed. Enjoy your Lunch. Visit Topkapi Palace, the great palace of the Ottoman sultans from the 15th to the 19th centuries, housing an exquisite collection of precious gems, jewelry thrones of sultans, robes worn by the sultans and their families, miniatures, the Holy Mantle and the Chamber of Sacred Relics. (The harem is not included in the program and visit will require an extra entrance fee.)  Duration for Topkapi Palace: 1 hour 45 minutes Our next stop, Hagia Irene, the Church of the Holy Peace, is one of the few churches in Istanbul that was never converted into a mosque. Hagia Irene reputedly stands on the site of a pre-Christian temple and has the distinction of being the first church built in Byzantium as it was converted into the capital of the Eastern Roman Empire. From there, we visit Gülhane Park, once a part of the outer gardens of Topkapı Palace, where the Edict of Gülhane, a declaration of rights and liberties that played an essential role in the modernization of the Ottoman Empire. After the proclamation of the Republic, Gülhane Park was for many years home to the Istanbul Zoo.