Copper River, Alaska's fourth largest river travels from the dry interior climate to the temperate rainforest along Prince William Sound.

Tulum, a jewel of the Riviera Maya, is a blend of ancient history, vibrant culture, and pristine natural beauty. Perched on a cliff overlooking the turquoise Caribbean Sea, the Tulum Ruins stand as one of the last cities built and inhabited by the Maya civilization. The well-preserved El Castillo, Temple of the Frescoes, and Temple of the Descending God offer insight into the architectural prowess and spiritual life of the ancient Maya.

In Cyprus, travelers are immersed in a culture that draws on Europe, the Middle East, and 9000 years of constant invasion. Crusader castles rub shoulders with ancient vineyards, frescoed monasteries overlook citrus orchards, and sandy, sun-soaked feet tread Roman mosaic floors.

Often called the Eternal City, Rome stands alone as Italy's most visited destination. The third most populated city in the European Union, Rome boasts ancient sites, yet has a modern flair — an exhilarating mix of the Old World and the new.

Antigua and Barbuda is an independent island state in the West Indies, in the eastern Caribbean Sea. It consists of three of the Leeward Islands.