Portsmouth is a port city and naval base on England’s south coast, mostly spread across Portsea Island. It’s known for its maritime heritage and Portsmouth Historic Dockyard. The dockyard is home to the interactive National Museum of the Royal Navy, the wooden warship HMS Victory, where Nelson died in the Battle of Trafalgar, and HMS Warrior 1860.

Málaga is a port city on southern Spain’s Costa del Sol, known for its high-rise hotels and resorts jutting up from yellow-sand beaches. Looming over that modern skyline are the city’s 2 massive hilltop citadels, the Alcazaba and ruined Gibralfaro, remnants of Moorish rule.

Valletta (or Il-Belt) is the tiny capital of the Mediterranean island nation of Malta. The walled city was established in the 1500s on a peninsula by the Knights of St. John, a Roman Catholic order. It’s known for museums, palaces and grand churches. Baroque landmarks include St. John’s Co-Cathedral, whose opulent interior is home to the Caravaggio masterpiece "The Beheading of Saint John."

Split is Croatia's second-largest city and the largest city in the Dalmatia region. It lies on the eastern shore of the Adriatic Sea and is spread over a central peninsula and its surroundings.

Dubrovnik is a city in southern Croatia fronting the Adriatic Sea. It's known for its distinctive Old Town, encircled with massive stone walls completed in the 16th century. Its well-preserved buildings range from baroque St. Blaise Church to Renaissance Sponza Palace and Gothic Rector’s Palace, now a history museum.

Brindisi is a port city on the Adriatic Sea, in southern Italy’s Apulia region. The red-stone Aragonese Castle stands on a small island at the harbor’s entrance. The tall Monumento al Marinaio d’Italia, a rudder-shaped limestone memorial to sailors, has sea and city views. Across the harbor, the Swabian Castle of Brindisi dates from the 13th century. At the top of Virgil’s Staircase are the Roman Columns.

Corfu, an island off Greece’s northwest coast in the Ionian Sea, is defined by rugged mountains and a resort-studded shoreline. Its cultural heritage reflects years spent under Venetian, French and British rule before it was united with Greece in 1864. Corfu Town, flanked by 2 imposing Venetian fortresses, features winding medieval lanes, a French-style arcade and the grand Palace of St. Michael and St. George.

Cagliari is the capital city of the Italian island of Sardinia. It’s known for the hilltop Castello, a medieval walled quarter situated high over the rest of the town. Architectural highlights include the 13th-century Cagliari Cathedral. Housed in a former arsenal, the Museo Archeologico Nazionale di Cagliari displays bronze objects, Roman ceramics and artifacts from the Nuragic age to the Byzantine era.

Cartagena is a port city and naval base in the Murcia region of southeast Spain. Founded by the Carthaginians around 220 B.C., the city boomed during the Roman period. Among its many Roman ruins are a 1st-century B.C. theater and Casa de la Fortuna, a villa with murals and mosaics. The Muralla Púnica (Punic Wall) interpretation center houses the remains of a 3rd-century B.C. defensive wall.

The Port of Gibraltar, also known as Gibraltar Harbour, is a seaport in the British Overseas Territory of Gibraltar. It was a strategically important location during the Napoleonic Wars and after 1869 served as a supply point for ships travelling to India through the Suez Canal.

Portsmouth is a port city and naval base on England’s south coast, mostly spread across Portsea Island. It’s known for its maritime heritage and Portsmouth Historic Dockyard. The dockyard is home to the interactive National Museum of the Royal Navy, the wooden warship HMS Victory, where Nelson died in the Battle of Trafalgar, and HMS Warrior 1860.