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Istanbul  
The old imperial centre of Istanbul stretches from the Sultanahmet district northwest to the Suleymaniye mosque complex, the covered bazaar and the remains of the city walls. To the north, across the Galata Bridge, the old Levantine areas of Galata and Pera are home to one of the city's most famous landmarks, the Galata tower. Close by is the entrance to the Tunel , an underground funicular railway running from Karakoy up to the start of Istiklal Caddesi, home to many of the city's restaurants and much of the nightlife, and on to Taksim Square , the heart of modern Istanbul.