Idyllic Islands of the Mediterranean from Rome

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.

Ponza is a volcanic island in the Tyrrhenian Sea where pastel houses climb tufa cliffs above a crescent harbour, Roman fish pools hide in sea caves, and the freshest seafood in Italy arrives daily at waterfront restaurants. Visit from May through October for swimming in crystalline waters, exploring dramatic coastline by boat, and experiencing an Italian island untouched by mass tourism.

Porto Cervo is the jewel of Sardinia's Costa Smeralda, a purpose-built luxury village where world-class sailing, pristine emerald beaches, and ancient Nuragic archaeology coexist against a backdrop of sculpted granite coastline. Visit from May through October, with June and September offering the ideal balance of Mediterranean warmth and refined exclusivity.

Bonifacio is a dramatically cliff-perched medieval citadel at Corsica's southern tip, where Genoese ramparts tower above a fjord-like natural harbour in the turquoise Strait of Bonifacio. Visitors should descend the vertiginous Escalier du Roi d'Aragon carved into the limestone cliffs and take a boat excursion to the pristine Lavezzi archipelago nature reserve for world-class snorkelling among sculpted granite formations. The ideal window is June or September, when the Mediterranean light is at its most luminous and the narrow streets of the haute ville remain blissfully uncrowded.

Portoferraio is the historic capital of Elba, the Tuscan island famous as Napoleon's place of exile, featuring Medici fortifications, pastel waterfront facades, and over 150 beaches. Must-dos include Napoleon's Villa dei Mulini, the Monte Capanne cable car, and sampling Aleatico dessert wine. May through October offers ideal Mediterranean conditions, with June and September best for avoiding crowds.

Calvi is Corsica's jewel-box port town where a commanding Genoese citadel overlooks the Mediterranean's finest urban beach — four miles of white sand lapped by Caribbean-clear water beneath snow-capped mountains. Visit June or September via Ponant or Explora Journeys for citadel walks, Corsican wild boar and brocciu cheese, and the essential paradox of an island that is French by law but entirely its own in character.

Mahón commands one of the Mediterranean's deepest natural harbours, a fjord-like inlet on Menorca that captivated British admirals, Phoenician traders, and Roman generals in turn — its Georgian townhouses and gin distilleries speaking eloquently to centuries of contested heritage. Explore the clifftop old town's baroque Santa María church with its 3,200-pipe organ, then cross the water to the imposing fortress of La Mola for sweeping harbour views. The island's prized caldereta de langosta, a slow-simmered lobster stew, is best savoured at the fishing village of Fornells. Visit between May and June or September and October for warmth without the summer crowds.

Beneath Ibiza's sun-drenched reputation as the world's clubbing capital lies a layered history stretching back to Phoenician traders who settled this Balearic island in 654 BC. The UNESCO-listed Dalt Vila — the walled hilltop citadel above Eivissa town — rewards exploration with Carthaginian burial grounds, Renaissance ramparts, and sweeping Mediterranean panoramas. For quieter pleasures, the crystalline coves of the island's north, such as Cala d'en Serra and Es Portitxol, rival any beach in Europe. The Phoenician necropolis of Puig des Molins is unmissable for history devotees. The season runs May through October, with June and September offering ideal weather without peak-summer crowds.

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.

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.