Located in northern Oman, Nakhal is best known for its impressive fort set dramatically against the backdrop of the Hajar Mountains. Originally built centuries ago and later expanded, the fort showcases traditional Omani architecture and offers sweeping views of the surrounding palm groves and rugged landscapes.

Roscommon is a county town in Ireland’s Hidden Heartlands, surrounded by the rural landscapes of central Ireland. The town is known for its collection of historic buildings and its position within a wider countryside of lakes, rivers, woodland, and farmland. Roscommon Castle, a substantial medieval fortress, stands beside Loughnaneane Park, while Roscommon Abbey and the former gaol add further layers to the town’s architectural heritage.

Weno is the largest island and administrative center of Chuuk State in the Federated States of Micronesia. It lies within the sheltered Chuuk Lagoon, a vast body of water enclosed by a surrounding reef and scattered with many smaller islands. Weno contains the state capital and serves as the main center for government, commerce, transportation, and services in the Chuuk Islands.

Coursing through 10 countries, the Danube is the second-longest river in Europe. This waterway, lined with fortresses and castles, rises in Germany's Black Forest and runs for 1,770 miles to the Black Sea. The Danube is an essential commercial thoroughfare for central and southeastern Europe, and several river cruise companies sail vessels on it year-round. Destinations along this river include Vienna, Budapest, Passau and Bratislava.

Liège, located along the Meuse River in eastern Belgium, is a city shaped by industry, resilience, and an independent spirit that dates back centuries. Once the capital of a powerful prince-bishopric, Liège has always done things its own way and is lived-in and layered with working neighborhoods, student cafés, and markets that tell the city’s real story. Every Sunday, locals gather at La Batte, one of the oldest and largest outdoor markets in Belgium.