Istanbul has been a magnet for travellers for centuries. The black sea and the Sea of Marmara shoulder the city and are linked by the Bosphorous Straits , one of the busiest and romantic waterways in the world. fantastic bargains to anyone prepared to enjoy a glass of Turkish whilst haggling with some of the worlds best salespeople.Istanbul has been a magnet for travellers for centuries. The black sea and the Sea of Marmara shoulder the city and are linked by the Bosphorous Straits , one of the busiest and romantic waterways in the world. fantastic bargains to anyone prepared to enjoy a glass of Turkish whilst haggling with some of the worlds best salespeople.