Novi Sad, Serbia’s second-largest city, sits along the banks of the Danube River and has long served as a cultural meeting point in the Balkans. Its centerpiece is Petrovaradin Fortress, a massive 18th-century stronghold nicknamed the "Gibraltar on the Danube." The fortress is known not just for its historic architecture but also for its network of underground tunnels and the iconic clock tower where the hands are reversed, meaning the large hand shows the hour.

Tucked between Jordan's sandstone cliffs in the southwestern desert, Petra was carved directly into rose-colored rock more than 2,000 years ago. Visitors approaching through the narrow gorge known as the Siq are rewarded with their first glimpse of Al-Khazneh, the Treasury, a towering facade that seems to appear from another world.

This 2,000-year-old city, where the Teutonic Order founded one of its first commanderies in the 13th century, lies on the convergence of the Moselle and Rhine Rivers.

The Gulf of Oman is a region of diverse landscapes and rich history. Stretching between the coasts of Oman, the United Arab Emirates, and Iran, this gulf is lined with stunning shorelines, port cities, and hidden natural gems.

Sapporo, (säp-pô´rô), capital of Hokkaido prefecture, SW Hokkaido, Japan. One of Japan's most rapidly growing urban centers, Sapporo is famous for its annual snow festival. It was the site of the 1972 winter Olympics.