Londonderry, often called Derry, is a city steeped in history and charm, uniquely surrounded by remarkably well-preserved 17th-century walls. In fact, it holds the title of being the only completely walled city in all of Ireland. Strolling along these ancient ramparts offers visitors not only a glimpse into the past but also breathtaking panoramic views of the winding River Foyle and the lively streets below.

Freiburg was founded by the Dukes of Zähringen in 1120, and the layout of streets and squares of the rapidly prospering metropolis is still impressively reflected in today's cityscape.

Located in the Coral Sea, just off the eastern coast of Australia, the Great Barrier Reef is the largest system of coral reefs in the world and a colorful ecosystem home to a variety of marine life, including sea turtles, fish, sharks, stingrays, and corals.

Gaborone, the vibrant capital of Botswana, offers a unique blend of modernity and tradition, making it an increasingly popular destination for travelers seeking an African city adventure. Founded in 1966, this city is relatively young but holds immense significance as the political and economic heart of Botswana.

Granada, nestled at the foot of the Sierra Nevada mountains in southern Spain, is a city where history and culture converge in a mesmerizing blend. The jewel of Granada is the Alhambra, a stunning palace and fortress complex that dates back to the 13th century. This UNESCO World Heritage Site is a testament to the city's Moorish past, showcasing intricate Islamic art and architecture.