Chuuk, one of the four states of the Federated States of Micronesia, is best known for its vast lagoon which is one of the largest enclosed lagoons in the world. But what sets Chuuk apart is what lies beneath those calm blue waters: an entire underwater fleet of sunken warships, aircraft, and submarines left from World War II. Often called the "Ghost Fleet of Truk Lagoon," these wrecks make Chuuk a global destination for experienced divers.

The Port of Tarragona is located in one of the most active economic areas of the Spanish Mediterranean, where the main petrochemical complex of the Spanish State is located.

Southeast Spain's seaport of Cartagena is a large naval base on the Mediterranean coast. The city was founded in 220 B.C. and boasts Roman ruins, mosaics and murals.

San Nicolas, known as Aruba’s “Sunrise City,” offers a completely different vibe from the island’s resort-heavy northwest coast. Located at the southeastern tip, this former oil refinery town has reinvented itself as the cultural heart of Aruba, filled with vibrant street art, local galleries, and a strong sense of community.

Located on the banks of the Danube, Spitz an der Donau is a charming market town in Austria's Wachau valley. Occupied since Celtic times, Spitz offers spectacular views of the Danube valley.