Lake Toba is another of the island's spectacular sights - a remarkable volcanic crater set in the middle of northern Sumatra, 176km from Medan. The lake is huge (the largest in South-East Asia), occupying the caldera of a giant volcano that collapsed on itself after a massive eruption some 100,000 years ago.

The Po River, the longest in Italy, flows eastward from Monte Viso, in the Cottian Alps, through the northern part of the country and drains into the Adriatic Sea near Venice. The Po flows through many important Italian cities, including Turin, Cremona, Piacenza, Ferrara.

Tan Chau, located in the Mekong Delta region of Vietnam, is most well-known for its exclusive silk production, using local materials such as dyes made from the mac nua (Diospyros mollis) fruit.

Stretching over 4,200 kilometers along the southwestern coast of South America, Chile is a country of dramatic contrasts and hidden surprises. From the world’s driest desert in the north to the icy fjords of Patagonia in the south, Chile offers a landscape that constantly reinvents itself. Visitors can walk through the Atacama Desert, where NASA tests Mars rovers, or gaze at the clearest night skies on Earth from the high-altitude observatories near San Pedro de Atacama.

Nestled in the heart of the Black Hills, Custer, South Dakota is a small town with big stories. Established in 1875 during the Black Hills Gold Rush, Custer holds the distinction of being the oldest town in the region still in existence. Today, it serves as a gateway to some of South Dakota’s most iconic sights. With historic buildings, locally owned shops, and friendly diners lining Mount Rushmore Road, it offers a laid-back atmosphere that balances Old West charm with modern-day hospitality.