Oceania Sirena: 34-Night World

Barcelona cruise port is the busiest in the Mediterranean, handling millions of passengers a year across multiple terminals. The city behind it earns that traffic.

Valencia cruise port is Spain's third-largest cruise port (after Barcelona and Palma de Mallorca) and a rising star on Western Mediterranean itineraries. Valencia sits on the east coast of Spain about 350 kilometers south of Barcelona and 350 kilometers east of Madrid.

Cartagena is a historic port city of about 215,000 people on Spain's southeastern Mediterranean coast, in the Murcia region. Founded by the Carthaginians in 227 BC (as Carthago Nova), the city has been contested by Carthaginians, Romans, Moors, and Spanish kingdoms, and its layered history shows in the archaeological sites scattered through the compact center.

Tangier sits at the northwestern tip of Africa, where the Mediterranean meets the Atlantic and Morocco looks across the Strait of Gibraltar at Spain, just 14 km away. The city has about 1.

Gibraltar is a British Overseas Territory at the southern tip of the Iberian Peninsula, a 6.7-square-kilometer enclave dominated by the Rock of Gibraltar, a 426-meter limestone monolith that guards the western entrance to the Mediterranean.

Lisbon cruise port is one of the most atmospheric arrivals in Europe. Ships sail up the Tagus River past the 25 de Abril Bridge (a near-twin of San Francisco's Golden Gate) and the Christ the King statue, with the city rising up on seven hills to the north.

Porto is Portugal's second city, sitting on the steep banks of the Douro River near the Atlantic coast. Cruise ships dock at the port of Leixoes, an industrial harbor in the suburb of Matosinhos about 8 kilometers north of Porto's historic center.

London (Southampton) cruise port is the busiest cruise departure point in the United Kingdom and one of the largest in Northern Europe. The port sits in Southampton, a city on England's southern coast about 80 miles southwest of London.

Reykjavik cruise port is Iceland's capital and the primary cruise hub for Arctic and North Atlantic itineraries. Most cruise ships dock at Skarfabakki (Old Harbor), about 2.