Sultanahmet is the historic core of the Old Town (historic peninsula), and the single best sightseeing area in Istanbul. Named after Sultan Ahmet who built the Blue Mosque.
The two principal monuments, the Blue Mosque and Hagia Sophia face each other. After visiting these, within a 15 minute walking distance you can also visit Topkapi Palace, The Hippodrome, Milion Stone, Basilica Cistern and the Grand Bazaar.
Sultan Ahmet Camii (Sultan Ahmet’s Mosque) was built in the early 17th century in response to Hagia Sophia. Tourism books and foreigners call it the Blue Mosque, for its blue iznik tile interior.
Between the two is a beautiful park set between the Blue Mosque and Hagia Sophia. As you stand in the park you have Hagia Sophia on one side, and the Blue Mosque on the other.
Hagia Sophia, Ayasofya in Turkish, and nicknamed the ‘Church of Holy Wisdom’. 1,400+ year old Byzantine Church still stands strong today after being converted into an Ottoman Mosque, and now a museum.