Regensburg, Germany’s medieval gem, will transport you to a bygone era. The site of both Celtic and Roman settlements, Regensburg flourished in the Middle Ages.

Lake Ohrid, a natural tectonic lake in the south-west corner of Macedonia, is the oldest lake in Europe and one of the oldest lakes in the world. Formed tectonically between four and ten million years ago, the lake is situated in limestone bedrock. Nestled amid mountains at an altitude of 2290 feet, the lake offers striking vistas of the surrounding beach and hills.

The Great Wall of China stretches across mountains, deserts, and grasslands, forming one of the most striking man-made landmarks in the world. Rather than a single continuous wall, it is a network of sections built with stone, brick, and packed earth, each shaped by the landscape it crosses. In areas near Beijing, such as Mutianyu, the wall winds along forested ridges, offering sweeping views that change with the seasons.

Ziguinchor is the regional capital of Casamance in southern Senegal, situated along the Casamance River in a landscape of waterways, mangroves, palm groves, rice fields, and wooded areas. Its riverfront setting gives the city a character that differs from the drier regions farther north. Ziguinchor is an important commercial and transport center for Casamance, with connections by road and river to communities throughout the region.

Evidence of our nation's birth abounds in Boston, a hub of revolution that is essentially the oldest city in the United States. Visitors are compelled to walk the 2.5-mile Freedom Trail around the city center, and bear witness to 16 historical locations related to the history of America.