"Once Istanbul ’s notorious prison, a lavish conversion in 1996 transformed this site, set amid the squiggle of lanes behind the colossal competing domes of the Hagia Sophia and Blue Mosque, into the city’s landmark Four Seasons Sultanahmet. Built in 1918, the hotel’s ornate neoclassical architecture has been finely restored, while the enclosed exercise yard is now a courtyard garden where guests can escape the hustle of the historic quarter. Classically designed rooms are awash with light blue and green hues and subtly scattered Turkish textiles and motifs. On a hot summer’s day, cool off with cocktails overlooking the old city’s minarets on the rooftop A’Ya Lounge. Eagle-eyed history fans can hunt for the 1938 graffiti left by a former inmate on a pillar near the courtyard. Being neighbors with theHagia Sophiahas extra benefits. The Four Seasons’ Extraordinary Experiences service offers a privileged chance to explore Emperor Justinian’s greatest achievement without the crowds, on an after-dark tour of the Hagia Sophia."