On the shores of the continent-straddling strait, this Four Seasons, in a restored 19th-century palace, showcases Istanbul’s minarets and towers in the distance. There’s a colonnaded indoor pool, a sunlounger-lined outdoor one and a series of traditional hammams – and the suites at the top of the historic building have their own rooftop terraces. If the hotel has given you a taste for Ottoman architecture, the concierge can arrange for a local interior designer to open the doors of his yali (waterside residence) just for you.