About 8 miles downstream—which means seaward, to the east—from central London, Greenwich is a small borough that looms large across the world. Once the seat of British naval power, it is not only home to the Old Royal Observatory, which measures time for our entire planet, but also the Greenwich Meridian, which divides the world into two—you can stand astride it with one foot in either hemisphere. Bear in mind that the journey to Greenwich is an event in itself. In a rush, you can take the driverless DLR train—but many opt for arriving by boat along the Thames. This way, you glide past famous sights on the London skyline (there’s a guaranteed spine chill on passing the Tower) and ever-changing docklands, and there’s usually a chirpy Cock-er-ney navigator enlivening the journey with his fun commentary. A visit to Greenwich feels like a trip to a rather elegant seaside town—albeit one with more than its fair share of historic sites. The grandiose Old Royal Naval Hospital, designed by Christopher Wren, was originally a home for veteran sailors. Today it’s a popular visitor attraction, with a more glamorous second life as one of the most widely used movie locations in Britain. Greenwich was originally home to one of England's finest Tudor palaces, and the birthplace of Henry VIII, Elizabeth I, and Mary I. Inigo Jones built what is considered the first "classical" building in England in 1616—the Queen's House, which now houses a collection of fine art. Britain was the world’s preeminent naval power for over 500 years, and the excellent National Maritime Museum> details that history in an engaging way. Its prize exhibits include the coat worn by Admiral Lord Nelson (1758–1805) in his final battle—bullet hole and all. The 19th-century tea clipper Cutty Sark was nearly destroyed by fire in 2007, but reopened in 2012 after a painstaking restoration. Now it’s more pristine than ever, complete with an impressive new visitor center. Greenwich Park, London's oldest royal park, is still home to fallow red deer, just as it has been since they were first introduced here for hunting by Henry VIII. The Ranger's House now houses a private art collection, next door to a beautifully manicured rose garden. Above it all is the Royal Observatory, where you can be in two hemispheres at once by standing along the Greenwich Meridian Line, before seeing a high-tech planetarium show. Toward north Greenwich, the hopelessly ambitious Millennium Dome has been successfully reborn as the O2 and now hosts major concerts and stand-up comedy gigs. More adventurous visitors can also go Up the O2 on a climbing expedition across the massive domed surface. Meanwhile, those who prefer excursions of a gentler kind may prefer to journey a couple of miles south of the borough, farther out into London’s southern suburbs, to the shamefully underappreciated Eltham Palace. Once a favorite of Henry VIII, parts of the mansion were transformed into an art deco masterpiece during the 1930s.

Hamburg is Germany’s second-largest city with a history dating back to Charlemagne. A major port, this vibrant city is home to art and culture, extensive shopping facilities, Baroque buildings and waterfront vistas. With its well-known fish market, art galleries and Museums together with several beautiful parks including a botanical garden, this is a city with something for everyone. British visitors who remember the Swinging Sixties may like to visit the streets around Grosse Freiheit, where an unknown pop group called The Beatles gave their first public performances in various local clubs before achieving worldwide fame.

By the 11th century, Copenhagen was already an important trading and fishing centre and today you will find an attractive city which, although the largest in Scandinavia, has managed to retain its low-level skyline. Discover some of the famous attractions including Gefion Fountain and Amalienborg Palace, perhaps cruise the city’s waterways, visit Rosenborg Castle or explore the medieval fishing village of Dragoer. Once the home of Hans Christian Andersen, Copenhagen features many reminders of its fairytale heritage and lives up to the reputation immortalised in the famous song ‘Wonderful Copenhagen’.

Gotland is Sweden's main holiday island, a place of ancient history, a relaxed summer-party vibe, wide sandy beaches, and wild cliff formations called raukar (the remnants of reefs formed more than 400 million years ago). Measuring 125 km (78 miles) long and 52 km (32 miles) at its widest point, Gotland is where Swedish sheep farming has its home. In its charming glades, 35 varieties of wild orchids thrive, attracting botanists from all over the world.

Mariehamn is the capital of the fractured Åland Islands, an autonomous region of Finland, which encompasses some 6,700 islands and skerries, which spray out across the Gulf of Bothnia towards Sweden. There's ample opportunity to stretch your legs here, with every outdoor activity imaginable available, and you can breathe in the freshest sea air you’ve ever tasted, as you kayak between islands, stroll flower-speckled fields, and sizzle in outdoor hot tubs. Known for being one of the Baltic’s sunniest destinations, you’ll also find a healthy supply of charming beaches, where you can lap up the rays. The region serves as a gateway to the Gulf, and has been a key witness to countless struggles and tussles over the years. It has a proud maritime heritage, and you can take a voyage through the exhibitions of the Aland Maritime Museum to learn more. See the genuine pirate flag on display - which is one of only three known to still be in existence. Its ominous skull and crossbones are sure to shiver your timbers. You can also experience life aboard an ocean-faring ship from Mariehamn's past, as you climb aboard the mighty, four-masted Pommern windjammer ship, which was donated to the museum once World War II had concluded.

Stockholm is a city in the flush of its second youth. Since the mid-1990s, Sweden's capital has emerged from its cold, Nordic shadow to take the stage as a truly international city. What started with entry into the European Union in 1995 gained pace with the extraordinary IT boom of the late 1990s, strengthened with the Skype-led IT second wave of 2003, and solidified with the hedge-fund invasion that is still happening today as Stockholm gains even more global confidence. And despite more recent economic turmoil, Stockholm's 1 million or so inhabitants have, almost as one, realized that their city is one to rival Paris, London, New York, or any other great metropolis.With this realization comes change. Stockholm has become a city of design, fashion, innovation, technology, and world-class food, pairing homegrown talent with an international outlook. The streets are flowing with a young and confident population keen to drink in everything the city has to offer. The glittering feeling of optimism, success, and living in the here and now is rampant in Stockholm.Stockholm also has plenty of history. Positioned where the waters of Lake Mälaren rush into the Baltic, it’s been an important trading site and a wealthy international city for centuries. Built on 14 islands joined by bridges crossing open bays and narrow channels, Stockholm boasts the story of its history in its glorious medieval old town, grand palaces, ancient churches, sturdy edifices, public parks, and 19th-century museums—its history is soaked into the very fabric of its airy boulevards, built as a public display of trading glory.