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.

Located in central Germany, Frankfurt is a vibrant cultural and economic hub nestled on the Main River. Museums and architectural gems abound in Frankfurt, from the Goethe House, to the picturesque timber houses of Römerberg town square, to the Museumsufer, a collection of museums lining the banks of the Main.

Antigua and Barbuda are located in the middle of the Leeward Islands in the Eastern Caribbean. Antigua, the largest of the British Leeward Islands, is about 14 miles long and 11 miles wide, encompassing 108 square miles. Barbuda, a flat coral island with an area of only 68 square miles, lies approximately 30 miles to the north. The population is approximately 68,000 and its capital is St. John's on Antigua.

Punakha sits in one of Bhutan’s most fertile valleys, cradled where the Mo Chhu and Pho Chhu rivers meet. For centuries it served as the kingdom’s capital and remains a place rich with stories woven through its fields, temples, and riverbanks. The city’s low elevation brings warmer weather than much of Bhutan’s highland regions, and rice paddies fill the landscape with vivid green during planting and golden hues at harvest.

Cayenne, the lively capital of French Guiana, sits where the Cayenne River meets the Atlantic Ocean, blending South American rhythms with French-Caribbean influence. While it's officially part of France, Cayenne feels worlds away from Paris, with colorful markets, colonial architecture, and a language mix that includes French, Creole, Portuguese, and Indigenous dialects.