Khartoum, the capital of Sudan, sits where the Blue and White Nile rivers meet, creating a unique landscape of waterways, islands, and riverbanks.

Known for its vast wilderness, towering mountains, glaciers, and wildlife, Alaska offers unmatched outdoor experiences and endless opportunities for exploration.

Nestled on the banks of the Danube River, Vidin, Bulgaria, is a city where history and scenic beauty converge. This ancient city, known for its well-preserved medieval fortress, the Baba Vida Castle, offers a unique glimpse into Bulgaria's past. The fortress, dating back to the 10th century, stands as one of the best-preserved medieval fortifications in the country.

Greece is a country where layers of history sit side by side with everyday life. In Athens, visitors can stand at the foot of the Acropolis and look up at the Parthenon, built more than 2,400 years ago, then walk a few blocks to modern cafes buzzing with conversation and music. The city’s neighborhoods, like Plaka and Monastiraki, offer both ancient ruins and small family-run shops selling handmade sandals and olive oil soap.

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.