Berlin, Germany: Trendy Prenzlauer Berg

Our royal tour of London starts with red-coat pageantry at Buckingham Palace. Riding red buses, black cabs, and the Tube, we pop into the Houses of Parliament at Westminster and visit Churchill’s underground war rooms — a World War II time warp. After looking into the eyes of those who put the great in Britain at the Portrait Gallery, we cruise the River Thames to the mighty Tower of London.

Istanbul's rich heritage spans the centuries from Christian Byzantium to Muslim Ottoman rule to today's thriving city. We start our look back at the Roman-tinged Hippodrome, then indulge in the ancient ritual of the Turkish bath. We take in the Blue Mosque and the grand Hagia Sophia, taste Turkish delight at the venerable Spice Market, and explore Topkapı Palace and its harem room deep within.

Paris is a world-class city — but also one that to millions is simply home. On this adventure, we're going local. We start at the city's proud symbol, the Eiffel Tower, then cruise the Seine before exploring a few distinctive neighborhoods. We visit the market for fresh food and flowers, window-shop along trendy streets, and cap our tour with a nighttime ride through the sparkling City of Light.