Barcelona to London (Dover)

Barcelona is the city where Roman history, Gothic grandeur, and Gaudí's delirious Modernisme collide in a Mediterranean coastal capital of astonishing energy and beauty. The Sagrada Família — still under construction after 140 years — continues its audacious ascent toward completion, while the Gothic Quarter's Roman-era foundations and the Passeig de Gràcia's extraordinary concentration of Modernisme masterpieces reward days of exploration. For a complete sensory experience, lose an afternoon in the covered labyrinth of La Boqueria market before descending to the waterfront for Catalan seafood at its finest. May through June and September through October offer the most pleasant weather; the city connects directly to Paris by overnight train.

Málaga distils three thousand years of Mediterranean civilisation into one of Andalusia's most compelling port cities, where the Moorish Alcazaba fortress surveys a modern waterfront of elegant promenades and sun-drenched café terraces. Do not leave without visiting the Museo Picasso — the artist was born here in 1881 — and ascending to the ruined Castillo de Gibralfaro for panoramic views stretching to the Rif Mountains of Morocco on clear days. Malagueta anchovies fried in olive oil and the sweet Pedro Ximénez-laced dessert wine are the city's defining pleasures. The shoulder seasons of April, May, and October offer perfect Mediterranean warmth.

Lisbon, Portugal's enchanting capital, stands out for its rich history, stunning architecture, and vibrant culture. Must-try experiences include savoring local dishes like bacalhau à brás and pastéis de nata at Mercado da Ribeira. The best time to visit is during the spring or fall, when the weather is mild and the city is alive with festivals and events.

Porto, set dramatically on the granite bluffs above the Douro River, is among Europe's most romantically dishevelled cities — a place where baroque church towers rise above terracotta rooftops and century-old azulejo tilework lines every alley. Cross the iron Dom Luís I Bridge for sweeping views and descend into Vila Nova de Gaia's atmospheric wine lodges for a tasting of aged tawny port direct from the barrel. Seafood is magnificent: salt cod prepared a hundred ways, barnacles glistening with lemon, and custard tarts still warm from the oven. Spring and early autumn offer the finest conditions.

Bordeaux, France's premier port city, is renowned for its historical significance, stunning architecture, and world-class wine. Must-do experiences include savoring local delicacies at Marché des Quais and exploring the breathtaking art installations at Place de la Bourse. The best season to visit is during the late spring and early autumn, when the weather is pleasant and the vineyards are in full bloom.

Lorient is a Breton port city reborn from wartime destruction, home to France's second-largest fishing port, repurposed WWII submarine pens, and the world's largest Celtic culture festival each August. Must-dos include the Festival Interceltique, touring the submarine base, and feasting on plateau de fruits de mer from the Keroman fish auction. Visit August for the festival or May through September for the best Breton weather.

St. Peter Port is Guernsey's charming harbor capital, combining a thirteenth-century castle, Victor Hugo's extraordinarily decorated exile home where he wrote Les Misérables, and steep streets of shops and markets overlooking one of the Channel Islands' finest harbors. Must-dos include touring Hauteville House, exploring Castle Cornet's five museums, and tasting the traditional Guernsey bean jar. May through September offers the warmest weather for exploring this compact, walkable port town.

Founded in 1517 by Francis I and rebuilt after World War II devastation by Auguste Perret's visionary grid of reinforced concrete — now a UNESCO World Heritage Site — Le Havre is a city where urban architecture becomes a form of art. The monumental church of Saint-Joseph, lit from within by fifteen thousand pieces of coloured glass, is a masterpiece of post-war modernism. Day trips to Honfleur, the exquisite half-timbered port that launched Impressionism, and to the D-Day beaches of Normandy, make Le Havre one of the channel's most strategically placed cruise calls. The city is most agreeable May through September; the Honfleur excursion rewards in any season.

Dunkirk, France, France is a distinctive port city where deep cultural heritage meets authentic local atmosphere, featured on itineraries by Azamara. Must-do experiences include walking the historic center to experience the layered architectural heritage, and seeking out the regional culinary traditions at a locally favored establishment away from the port area. The optimal time to visit is June through August, when summer months bring the warmest temperatures and longest days.