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.

Cork City's nearby harbor district has seen plenty of history. Cork Harbour's draws include Fota Island—with an arboretum, a wildlife park, and the Fota House ancestral estate—and the fishing port of Cobh.

Bordeaux as a whole, rather than any particular points within it, is what you'll want to visit in order to understand why Victor Hugo described it as Versailles plus Antwerp, and why the painter Francisco de Goya, when exiled from his native Spain, chose it as his last home (he died here in 1828). The capital of southwest France and the region's largest city, Bordeaux remains synonymous with the wine trade: wine shippers have long maintained their headquarters along the banks of the Garonne, while buyers from around the world arrive for the huge biennial Vinexpo show (held in odd-number years).Bordeaux is, admittedly, a less exuberant city than many others in France, but lively and stylish elements are making a dent in its conservative veneer. The cleaned-up riverfront is said by some, after a bottle or two, to exude an elegance reminiscent of St. Petersburg, and that aura of 18th-century élan also permeates the historic downtown sector—“le vieux Bordeaux"—where fine shops invite exploration. To the south of the city center are old docklands undergoing renewal—one train station has now been transformed into a big multiplex movie theater—but the area is still a bit shady. To get a feel for the historic port of Bordeaux, take the 90-minute boat trip that leaves Quai Louis-XVIII every weekday afternoon, or the regular passenger ferry that plies the Garonne between Quai Richelieu and the Pont d'Aquitaine in summer. A nice time to stroll around the city center is the first Sunday of the month, when it's pedestrian-only and vehicles are banned.

Bordeaux as a whole, rather than any particular points within it, is what you'll want to visit in order to understand why Victor Hugo described it as Versailles plus Antwerp, and why the painter Francisco de Goya, when exiled from his native Spain, chose it as his last home (he died here in 1828). The capital of southwest France and the region's largest city, Bordeaux remains synonymous with the wine trade: wine shippers have long maintained their headquarters along the banks of the Garonne, while buyers from around the world arrive for the huge biennial Vinexpo show (held in odd-number years).Bordeaux is, admittedly, a less exuberant city than many others in France, but lively and stylish elements are making a dent in its conservative veneer. The cleaned-up riverfront is said by some, after a bottle or two, to exude an elegance reminiscent of St. Petersburg, and that aura of 18th-century élan also permeates the historic downtown sector—“le vieux Bordeaux"—where fine shops invite exploration. To the south of the city center are old docklands undergoing renewal—one train station has now been transformed into a big multiplex movie theater—but the area is still a bit shady. To get a feel for the historic port of Bordeaux, take the 90-minute boat trip that leaves Quai Louis-XVIII every weekday afternoon, or the regular passenger ferry that plies the Garonne between Quai Richelieu and the Pont d'Aquitaine in summer. A nice time to stroll around the city center is the first Sunday of the month, when it's pedestrian-only and vehicles are banned.

Lively, commercial Oporto is the second largest city in Portugal after Lisbon. Also called Porto for short, the word easily brings to mind the city's most famous product - port wine. Oporto's strategic location on the north bank of the Douro River has accounted for the town's importance since ancient times. The Romans built a fort here where their trading route crossed the Douro, and the Moors brought their own culture to the area. Oporto profited from provisioning crusaders en route to the Holy Land and enjoyed the riches from Portuguese maritime discoveries during the 15th and 16th centuries. Later, port wine trade with Britain compensated for the loss of the spice trade and the end of gold and gem shipments from Brazil. In the 19th century, the city went through a period of new prosperity with the rise of industries. In its wake followed the building of workers' quarters and opulent residences. Since the declaration of Oporto as a World Heritage Site by UNESCO, the city aims to build up a cultural reference that will provide it with a new image, based on deep historical roots. Among the attractions that make Oporto such an interesting place are its graceful bridges spanning the Douro River, a picturesque riverfront quarter and, most notable, its world-famous port wine lodges. Although Oporto is a bustling centre and home to many different businesses, the source of its greatest fame is the rich, sweet fortified red wine we know as port.

Set on seven hills on the banks of the River Tagus, Lisbon has been the capital of Portugal since the 13th century. It is a city famous for its majestic architecture, old wooden trams, Moorish features and more than twenty centuries of history. Following disastrous earthquakes in the 18th century, Lisbon was rebuilt by the Marques de Pombal who created an elegant city with wide boulevards and a great riverfront and square, Praça do Comércio. Today there are distinct modern and ancient sections, combining great shopping with culture and sightseeing in the Old Town, built on the city's terraced hillsides. The distance between the ship and your tour vehicle may vary. This distance is not included in the excursion grades.

A Mediterranean city and naval station located in the Region of Murcia, southeastern Spain, Cartagena’s sheltered bay has attracted sailors for centuries. The Carthaginians founded the city in 223BC and named it Cartago Nova; it later became a prosperous Roman colony, and a Byzantine trading centre. The city has been the main Spanish Mediterranean naval base since the reign of King Philip II, and is still surrounded by walls built during this period. Cartagena’s importance grew with the arrival of the Spanish Bourbons in the 18th century, when the Navidad Fortress was constructed to protect the harbour. In recent years, traces of the city’s fascinating past have been brought to light: a well-preserved Roman Theatre was discovered in 1988, and this has now been restored and opened to the public. During your free time, you may like to take a mini-cruise around Cartagena's historic harbour: these operate several times a day, take approximately 40 minutes and do not need to be booked in advance. Full details will be available at the port.

Hedonistic and historic, Eivissa (Ibiza, in Castilian) is a city jam-packed with cafés, nightspots, and trendy shops; looming over it are the massive stone walls of Dalt Vila —the medieval city declared a UNESCO World Heritage site in 1999—and its Gothic cathedral. Squeezed between the north walls of the old city and the harbor is Sa Penya, a long labyrinth of stone-paved streets that offer some of the city's best offbeat shopping, snacking, and exploring. The tourist information office on Vara de Rey has a useful map of walks through the old city.

The infinite variety of street life, the nooks and crannies of the medieval Barri Gòtic, the ceramic tile and stained glass of Art Nouveau facades, the art and music, the throb of street life, the food (ah, the food!)—one way or another, Barcelona will find a way to get your full attention. The capital of Catalonia is a banquet for the senses, with its beguiling mix of ancient and modern architecture, tempting cafés and markets, and sun-drenched Mediterranean beaches. A stroll along La Rambla and through waterfront Barceloneta, as well as a tour of Gaudí's majestic Sagrada Famíliaand his other unique creations, are part of a visit to Spain's second-largest city. Modern art museums and chic shops call for attention, too. Barcelona's vibe stays lively well into the night, when you can linger over regional wine and cuisine at buzzing tapas bars.