Eight-mile-long island, where a variety of water sports is available. Stroll the bustling port area, where hundreds of stores sell goods ranging from Columbian emeralds to imported fine china and porcelain.

Cayenne, the lively capital of French Guiana, sits where the Cayenne River meets the Atlantic Ocean, blending South American rhythms with French-Caribbean influence. While it's officially part of France, Cayenne feels worlds away from Paris, with colorful markets, colonial architecture, and a language mix that includes French, Creole, Portuguese, and Indigenous dialects.

Ol Doinyo Lengai, often called the "Mountain of God," is an active volcano located in northern Tanzania and is a must-visit for adventurous travelers. Towering over the Great Rift Valley, this majestic peak is unique due to its lava composition. Unlike most volcanoes that produce molten lava, Ol Doinyo Lengai emits natrocarbonatite lava, which is unusually cool and flows like water. This rare phenomenon makes it one of the most intriguing volcanic landscapes on Earth.

West of Hiawatha National Forest, Marquette sits on the shore of Lake Superior and is the biggest city on Michigan's Upper Peninsula. Visit historic Marquette Harbor Lighthouse for spectacular panoramic views of Superior, or take advantage of snowy Marquette Mountain and a variety of winter sports at the height of Marquette's winter season.

Basel is the global center of the pharmaceutical industry, but most travelers visit for the world-famous ART Basel festival, as well as the numerous art galleries, iconic architecture and museums.