Civitavecchia to London (Southampton)

Rome's ancient maritime gateway since the Emperor Trajan commissioned its harbour in 106 AD, Civitavecchia is the natural prologue to the Eternal City — just seventy minutes southeast by express rail. The port's Renaissance fortress, designed in part by Michelangelo, anchors a working waterfront that has welcomed travellers for millennia. Beyond Rome's unmissable monuments, consider an afternoon in the Civitavecchia thermal baths, drawing on mineral waters prized since antiquity. Spring and autumn offer the ideal balance of mild weather and manageable crowds for exploring the capital's layered history.

Purpose-built as a Medici utopia in the late sixteenth century, Livorno was conceived from the outset as a city without discrimination — its founding Leggi Livornine granted equal rights to Jews, Christians, Muslims, and merchants of every nation, making it one of the most cosmopolitan cities in Renaissance Europe. Today, the Venetian-style canals of the Venezia Nuova quarter reflect colourful palazzi with a distinctly faded glamour, while the Mercato Centrale's fish counters display the cacciucco ingredients — a robust Livornese brodetto of five sea creatures — that make this port city a pilgrimage for serious eaters. Day trips to Pisa and Lucca are effortless from here. The season runs April through October.

Monaco, Monaco is a distinctive port city where deep cultural heritage meets authentic local atmosphere, featured on itineraries by Regent Seven Seas Cruises. 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 May through September, when mild temperatures and long days favor unhurried exploration.

Toulon is the French Navy's Mediterranean home port, where the daily Cours Lafayette market, Mont Faron cable-car panoramas, and proximity to the Hyères Islands' pristine beaches deliver the French Riviera without the glamour-tax of Cannes or Saint-Tropez. Visit April through October via Cunard or Oceania for authentic Provençal markets, the 'other D-Day' memorial, and the Riviera that the French actually use.

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.

Palma de Mallorca announces itself with one of the most spectacular Gothic cathedrals in the world — La Seu, its honey-coloured sandstone buttresses rising directly from the bay, its interior modified by Antoni Gaudí and illuminated by the world's largest Gothic rose window. The old town behind it is a quarter of Arab baths, Renaissance palaces converted into boutique hotels, and the Passeig del Born — a plane-tree-shaded promenade where Balearic life conducts itself with unhurried grace. The local ensaïmada pastry and fresh sobrasada sausage from the island's black pigs are essential breakfast rituals. Visit May, June, or September: warm, brilliant, and measurably calmer than the July–August peak.

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.

Tangier is Morocco's storied gateway between Africa and Europe, a city of Phoenician origins where a whitewashed medina, vibrant souks, and a cosmopolitan waterfront converge at the Strait of Gibraltar. Visitors should not miss savouring traditional pastilla in a rooftop riad and exploring the Kasbah's amber-lit ramparts at sunset. The ideal season to arrive is April through June or September through October, when mild Mediterranean temperatures and fewer crowds allow the city's layered beauty to reveal itself at an unhurried, luxurious pace.

Cádiz, founded by Phoenician traders around 1100 BC and a strong contender for the oldest continuously inhabited city in Western Europe, juts into the Atlantic on a narrow peninsula where honey-colored ramparts frame improbable views of open ocean and the sun sets directly into the sea. The old quarter is an intoxicating labyrinth of baroque churches, hidden plazas, and carnival spirit — Cádiz's annual February carnival is the wildest and most satirically sharp in Spain — while the tapas culture here, centered on fresh Atlantic seafood cooked with Andalusian simplicity, represents Spanish cuisine at its most elemental and joyful. Visit February for carnival or spring for gentle Atlantic breezes. Seville is ninety minutes inland by bus or rail.

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.

La Coruña, the Atlantic gateway to Spain's verdant Galicia region, is home to the Tower of Hercules — the world's oldest functioning Roman lighthouse and a UNESCO World Heritage Site — and a waterfront of luminous glass galleries unlike anything else in Europe. Visitors should not miss savouring pulpo á feira and wild percebes at the local markets, nor the short journey to Santiago de Compostela along the Camino. Late spring through early autumn offers the mildest weather, with September providing warm days, golden light, and fewer crowds along the granite streets of the Ciudad Vieja.

Bilbao is the Basque Country's cultural capital, where Frank Gehry's iconic Guggenheim Museum anchors a city transformed from industrial port to world-class destination. Visitors should not miss the pintxo bars of the Casco Viejo and the extraordinary Michelin-starred dining scene, alongside the museum's titanium splendor. The ideal months to visit are May through October, when mild Atlantic weather bathes the city in soft light perfect for exploring its riverside promenades and nearby Rioja wine country.

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.

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.

Saint Helier is the capital of Jersey, a self-governing Crown Dependency in the English Channel that blends British and Norman French heritage across 119 square kilometres of granite cliffs, tidal flats, and world-famous dairy farmland. Must-dos include the Victorian Central Market, tasting Jersey Royal potatoes and spider crab, and walking the dramatic north coast cliff paths. Visit May through June for the potato harvest, wildflower cliffs, and longest days.

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.

Southampton, England's storied ocean liner capital on the southern coast, carries an indelible maritime identity — this is the port from which the Titanic departed and from which the Queen Mary 2 still sails in grandeur today. The medieval Bargate and City Walls speak to a history stretching back to Roman times, while the SeaCity Museum tells the story of the great liners with moving intimacy. Day excursions reach Winchester's magnificent cathedral, the stately rooms of Beaulieu, and the primeval wilderness of the New Forest — where ancient ponies still roam freely. Spring and summer offer the most pleasant conditions for exploring the region.