Columbus, city and seat of Muscogee County, western Georgia, a port at the head of the Chattahoochee River, opposite Phenix City, Alabama. Columbus is a regional transportation, trade, cultural, and manufacturing hub. Its many textile, food-processing, and metalworking industries are powered by hydroelectric plants on the Chattahoochee River.

Yemen’s Old City of Sana'a stands as a living mosaic of civilizations. Just past the ornate Bab al‑Yaman gate, towering homes made of adobe, lime plaster, and layered with qatad (plaster) rise like giants in the maze of markets and quiet courtyards. Nearby, the ruins of Ghumdan Palace, once said to rival skyscrapers, recall a pre‑Islamic past and offer echoes of bygone architectural ambition.

Germany offers a wide range of experiences, shaped by centuries of history, regional traditions, and striking landscapes. In Berlin, the past and present share the same streets. Visitors can walk along remnants of the Berlin Wall and then explore a thriving street art scene in neighborhoods like Kreuzberg and Friedrichshain. The city's Museum Island, a UNESCO World Heritage Site, houses ancient artifacts and 19th-century masterpieces just a short walk from modern coffee shops and rooftop bars.

Potsdam, the capital of Germany’s Brandenburg state, lies just southwest of Berlin and is best known for its grand palaces, landscaped gardens, and role as a seat of Prussian royalty.

Located in Pennsylvania, Pittsburgh is one of the oldest cities in the nation.