The Sultanahmet district is the heart of historic Old Istanbul. The Old City of Istanbul is the oldest part of the city, and the location of most of its historic sights.
Once the starting point of the Hippie Trail, the Sultanahmet area has been the main tourist district of the city since the 1960s. As the Hippodrome of Constantinople, it was for long one of the main social centres in the city — a role it still temporarily plays for the evening feasts during the Ramadan — and hence is a part of the old city with an exceptionally disproportionate number of historic sights. The name of the district derives from the Turkish name of the imposing Blue Mosque on one side of its main square, which in turn is named after the Ottoman sultan Ahmet I (r. 1603–1617), who had the mosque built, and is buried in a mausoleum on its grounds.
Many of Istanbul’s historical gems, mostly consisting of Byzantine and Ottoman-built monuments are within the Old City. Most are located a short walk away from, if not immediately on the edges of, Sultanahmet Square. Some other sights are dispersed throughout the peninsula.