Norwegian Gem: 7-Night Europe

Ravenna is a mid-sized city of about 160,000 people in Italy's Emilia-Romagna region, sitting on the Adriatic coast south of Venice. The city served as the capital of the Western Roman Empire, the Ostrogothic Kingdom, and the Byzantine Exarchate, leaving it with the finest collection of early Christian and Byzantine mosaics anywhere outside Istanbul.

Split cruise port is the main gateway to central Dalmatia and one of the most remarkable cities in Croatia. The city is built around and inside Diocletian's Palace, a 1,700-year-old Roman fortress that the emperor built as his retirement residence around 300 AD.

Dubrovnik cruise port is the southern gateway to Croatia's Adriatic coast and one of the most visually striking stops in the Mediterranean. Ships dock at Port Gruž, about 3 kilometers northwest of the Old Town, with the walled medieval city perched on a rocky peninsula jutting into the sea.

Kotor cruise port is one of the most visually spectacular arrivals in the Adriatic. Ships sail through a deep fjord-like bay (Boka Kotorska) surrounded by limestone mountains that rise steeply from the water, with the walled medieval town of Kotor tucked at the base.

Corfu cruise port is one of the most visited stops on Eastern Mediterranean and Greek Islands itineraries. The island sits off Greece's northwestern coast, just a short ferry ride from the southern tip of Albania, and has a distinct cultural identity shaped by centuries of Venetian, French, and British rule rather than the Ottoman history that dominates other Greek islands.

Messina cruise port sits at the northeastern tip of Sicily, directly across the narrow Strait of Messina from mainland Italy. Ships dock right at the city waterfront, making it one of the easiest Mediterranean ports to step off and explore.