Istanbul, previously known as Byzantium and Constantinople, is where East meets West. Situated on both sides of the narrow strait Bosporus, Istanbul is a connector between Europe and Asia.

Say "Aloha!" to the big city on Oahu's South Shore: Honolulu. This sunny capital city is the main portal to the larger Hawaiian archipelago, and the perfect base for exploring Oahu.

Berlin has an undeniable history. The horrors of World War II, division, reunification, revolution all profoundly impacted the city in the 20th century. Today, visitors will find a sophisticated, high-energy city with endless cultural, architectural and gastronomic attractions.

Be sure to explore the restaurants and shopping, and don't miss the island's most famous frozen treat, Tasaka Guri-Guri.

To visit Barcelona is to embrace both the past and the future. There is much to do and see in this cosmopolitan capital of Catalonia, from medieval structures to beaches to UNESCO Heritage Sites by Antoni Gaudí and Lluís Doménech i Montaner.