Niagara Falls, New York, is home to one of the most powerful natural spectacles in North America. More than 3,000 tons of water pour over the edge every second, creating a thunderous roar and a rising mist that can be felt from blocks away. Visitors can stand just feet from the American Falls at Prospect Point or take the iconic Maid of the Mist boat tour, which has operated since 1846 and now features all-electric vessels.

On the Nile's east bank sits Luxor, a onetime stronghold for Egyptian pharaohs. Key sites include Luxor Temple, Karnak Temple, and the Valley of the Kings.

The dazzling capital of the Czech Republic, the explorable Prague has fittingly been nicknamed "the City of a Hundred Spires." Halved by the Vltava River and notable for architecture Baroque, Renaissance, and Gothic, visitors will find much to take in here.

Greenville, South Carolina sits at the foothills of the Blue Ridge Mountains and has grown from a former textile center into one of the Southeast’s most appealing small cities.

Padua, a hidden gem in Northern Italy’s Veneto region, is a city where medieval splendor meets a vibrant modern atmosphere. Known for its ancient university, founded in 1222, Padua is one of the oldest and most prestigious in the world, having nurtured the minds of great scholars like Galileo Galilei.