Historically known as Byzantium and Constantinople, Istanbul is the only city in the world situated on two continents. The Bosphorus divides the city – western half in Europe and eastern half in Asia. One of the city’s most iconic structures, the Hagia Sophia Istanbul dates from Byzantine times. For more than a thousand years, it stood as the world’s largest cathedral before being converted into a mosque and later, a museum. Just across from Hagia Sophia is the magnificent Sultan Ahmed Mosque, popularly known as the Blue Mosque. Round out your day with a visit to the opulent Topkapi Palace and you’ll have seen some of Istanbul’s most impressive sights. Even in the winter, Istanbul is one of Europe’s (and Asia’s) most delightful cities.