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.

Nestled along the south bank of the Danube, this historical Austrian city bursts with charm. A favorite stop on European river cruises, the city's most famous attraction is Melk Abbey, which dates back to the 11th century. The original Benedictine structure was lost to fires and foreign invasion, then rebuilt during the 18th century in lavish Baroque style, including a library and inner church covered in magnificent frescoes and gilded fixtures.

The capital of Crete, Heraklion is a Greek port city and a popular stop on Mediterranean and Greek cruises. The city is an historical marvel, replete with archaeological wonders and remnants of the region's past. Highlights include the Heraklion Archaeological Museum, the Rocca a Mare Fortress, the Venetian Loggia, and just past the city limits, the Palace of Knossos.

San Francisco offers something for everyone. Whether it's exploring world-famous landmarks, discovering hidden gems in its neighborhoods, or enjoying the coastal breeze by the bay, this vibrant city promises a memorable experience for all who visit.

Podgorica, the capital of Montenegro, showcases the country’s contrasting landscapes and deep-rooted history. Although much of the city was rebuilt after World War II, traces of its Roman and Ottoman past still remain. Visitors can explore the ruins of Doclea, a Roman settlement just outside the city, where surviving columns and mosaics give a glimpse into life nearly two millennia ago.