Evidence of our nation's birth abounds in Boston, a hub of revolution that is essentially the oldest city in the United States. Visitors are compelled to walk the 2.5-mile Freedom Trail around the city center, and bear witness to 16 historical locations related to the history of America.

As a city located in a Baltic Sea archipelago, it's not surprising that Stockholm has 50 bridges and sightseeing boats moving people between its 14 islands. This contemporary and welcoming capital of Sweden is nonetheless easily navigable by foot. Every district here has a distinct flavor, from the sophisticated Östermalm to the bustling downtown energy of Norrmalm to the delightful Old Town.

Coimbra, set along the banks of the Mondego River in central Portugal, is a historic city known for its academic legacy and old-world charm. Once the medieval capital of Portugal, it is home to the University of Coimbra, one of the oldest in Europe and a UNESCO World Heritage Site.

Heimaey, the largest island in Iceland’s Vestmannaeyjar archipelago, is a captivating destination renowned for its dramatic landscapes and volcanic history. A visit to Heimaey offers a unique blend of natural beauty and cultural heritage.

This small cruise port is located in Mexico's Yucatan peninsula south of Playa del Carmen, near Belize. It is famous for Chacchoben, a breathtaking set of Mayan ruins. The port has a new and modern shopping mall and the central plaza has saltwater pools and 'swim-up' style bars for tourists to enjoy.