Lucca, a Tuscan city surrounded by remarkably intact Renaissance walls, offers more than just postcard views. Known for its quiet streets and grand piazzas, Lucca stands apart with its circular street layout, still following the lines of a Roman amphitheater from centuries ago. The walls, now repurposed as a 4-kilometer tree-lined park, are a favorite route for locals and visitors who explore them on foot or by bike, passing old bastions and panoramic viewpoints along the way.

The Yangtze River, a magnificent artery of China, stretches over 6,300 kilometers (3,917 miles) from the Tibetan Plateau to the East China Sea. As the longest river in Asia and the third longest in the world, it weaves through breathtaking landscapes and vibrant cities, making it a prime destination for travelers seeking both adventure and cultural immersion.

Massachusetts, a state steeped in American history and vibrant culture, offers visitors a rich tapestry of experiences. Begin your journey in Boston, the state capital, where history comes alive along the Freedom Trail. This 2.5-mile route takes you through pivotal sites such as the Massachusetts State House, Paul Revere’s House, and the Old North Church, where the famous signal lanterns were hung during the American Revolution.

The Mara River in Tanzania is a natural wonder that draws adventurers and wildlife enthusiasts alike. Flowing through the heart of the Serengeti and into Kenya’s Maasai Mara, this river is best known as the lifeblood of the Great Migration. Each year, from July to October, millions of wildebeest, zebras, and gazelles make a perilous crossing of the Mara. It’s a spectacle of nature that leaves visitors in awe, making it one of Africa’s most sought-after safari experiences.

Southeast Spain's seaport of Cartagena is a large naval base on the Mediterranean coast. The city was founded in 220 B.C. and boasts Roman ruins, mosaics and murals.