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.

Trinidad, Cuba, is a mesmerizing time capsule that transports visitors to another era with its cobblestone streets, pastel-colored colonial buildings, and horse-drawn carts. Founded in 1514 by Spanish conquistador Diego Velázquez de Cuéllar, this city, located in central Cuba, is one of the best-preserved colonial towns in the Caribbean. Trinidad's rich history and enchanting architecture make it an essential destination for anyone seeking an authentic Cuban experience.

Located in northern Germany, Hamburg is an important commercial hub on the Elbe River and unique for the expansive system of canals which divide the city in two. Replete with fascinating architecture and scenic waterfront promenades, Hamburg offers plenty to see and explore!

Ulm, Germany, a picturesque city on the banks of the Danube River, offers a rich tapestry of history and modern charm. Dominating its skyline is the Ulm Minster, home to the tallest church steeple in the world at 161.5 meters (530 feet). This Gothic masterpiece invites visitors to climb its 768 steps for a breathtaking panoramic view of the city and the surrounding countryside.

An essential passageway between the Atlantic and Pacific Oceans, the Panama Canal is an extraordinary technological landmark and a testament to human innovation. Built in the early twentieth century by American engineers, the canal weaves through the Panamanian isthmus and allows easy access for commercial freighters and cruise ships alike.