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.

Yosemite National Park, nestled in California's Sierra Nevada mountains, is a stunning sanctuary of natural beauty and grandeur. Known for its dramatic granite cliffs, ancient giant sequoias, and cascading waterfalls, Yosemite is a paradise for outdoor enthusiasts and nature lovers alike.

Passau sits on the confluence of the Danube, the Inn and the Ilz, so it is fitting that it is known as "the Dreiflüssestadt", which means the “City of Three Rivers.” The historical center offers a cathedral, churches and museums to explore, and the embankment is perfect for a romantic stroll.

Astoria, Oregon is the state's oldest city. Located on the Columbia River near the Pacific Ocean, Astoria is rich in history, including fishing, canning and the Lewis and Clark Expedition.

French Guiana is situated in the equatorial forest zone on the northeastern coast of South America. The offshore islands include the Îles du Salut, or Safety Islands, of which Devils Island is the best known.