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.

Make friends with Rostock, one of Germany's most beautiful Hanseatic cities - where the Baltic Sea laps the shores of Mecklenburg/Western Pomerania and the air tastes slightly salty, where old-fashioned sailboats provoke nostalgic longings, and where brick gables reach into the sky.

The Lemaire Channel is a spectacular sight with enormous sheer cliffs falling straight into the sea. It's a narrow channel flanked by the Antarctic Peninsula on one side and Booth Island on the other. So photogenic is the channel that it's nicknamed 'Kodak Gap', and it's only once you're well within it that a way through is visible.

Adak Island lies in the central Aleutian Islands of southwest Alaska, where steep volcanic mountains meet the North Pacific. The community of Adak occupies a sheltered harbor on the island and is one of the few remote Aleutian locations accessible by commercial airline. Much of the island consists of open tundra, rugged slopes, coastal wetlands, and rocky shorelines shaped by strong winds and frequent rain.

Located in southeast Tennessee, it is the home of the TVA and was the site of two famous Civil War battles: Chattanooga and Chicamauga