4 nights Mediterranean Crossing from Civitavecchia (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.

Valencia, Spain's luminous third city, dazzles with a creative energy anchored by two thousand years of layered civilization — Roman foundations, Moorish irrigation gardens, a Gothic cathedral housing what many believe to be the Holy Grail, and Santiago Calatrava's futuristic City of Arts and Sciences gleaming beside a park-filled riverbed. The city invented paella over an open fire of orange-wood in the surrounding huerta, and the Las Fallas festival each March — when neighborhoods compete to erect and then ceremonially burn towering satirical sculptures — is one of Europe's most spectacular celebrations. Valencia's Mediterranean climate makes it exceptional year-round.

Tarragona, a historic Catalonian port city, is renowned for its Roman ruins and vibrant local life. Must-do experiences include exploring the ancient Roman amphitheater and indulging in local dishes like calçots and fideuà. The best time to visit is during the spring and early autumn, when the weather is mild and the city is alive with cultural festivities.

Founded by Greek sailors in 600 BC, Marseille is France's oldest and most viscerally alive city — a Mediterranean port where the catch is still sold from fishing boat decks at the Vieux-Port each morning beneath the golden Madonna of Notre-Dame de la Garde, gleaming on her basilica above the city. The bouillabaisse served at harbourside institutions such as Chez Fonfon is not merely a dish but a rite, its saffron-stained broth tying Marseille to its Hellenic roots. Explore the dramatic Calanques national park, a coastal labyrinth of turquoise coves just south of the city. Spring and autumn are the finest seasons.