Oaxaca, nestled in the heart of southern Mexico, is a city where ancient traditions and vibrant culture thrive. Renowned for its rich history and indigenous heritage, Oaxaca offers a unique blend of pre-Columbian, colonial, and modern influences. The city's historic center, a UNESCO World Heritage site, is a testament to its past, featuring stunning colonial architecture such as the Santo Domingo de Guzmán Church, a masterpiece of Baroque art.

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.

Belgium is located north of France and its residents are some of the most friendly in Europe. This country is the diamond capital of the world — visit its many museums, castles, cathedrals, fine art and food.

Heidelberg, located along the scenic banks of the Neckar River in southwestern Germany, is a city steeped in history, culture, and charm. Known for its prestigious university, which is one of the oldest in Europe, the city draws visitors with its picturesque old town, medieval architecture, and vibrant academic atmosphere.

Cagliari is Sardinia's capital and largest city. Several civilizations have left their imprint here architecturally and culturally. Must-sees include the Museo Archeologico Nazionale di Cagliari, with its Roman and Byzantine treasures, as well as Castello, a medieval quarter situated on a hill above the city. The city is also known for its food and vibrant nightlife.