Seven miles outside of historic Athens, the Greek coastal city of Piraeus lies upon the sparkling waters of the Aegean Sea and is the largest passenger port in Europe, servicing nearly 20 million passengers per year.

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.

Located on the Rhône River, Avignon is the city to which the Popes fled when leaving the corruption of Rome in the 14th century. The palace they built, 'Le Palais des Papes,' is a breathtaking must see.

San Antonio is a city where centuries-old missions, lively markets, and a strong sense of place come together in unexpected ways. At the heart of it all is the Alamo, the former Spanish mission that became a symbol of Texas independence after the pivotal 1836 battle. Beyond its landmarks, San Antonio thrives through its neighborhoods. The River Walk weaves through downtown, lined with restaurants, shops, and galleries.

Natural wonders await you in the steaming, geothermally active North Island city of Rotorua, New Zealand. Pohutu Geyser erupts several times per day, and blistering mud pools provide a truly unique sightseeing experience. When in Rotorua, tourists also visit its living Maori village, as well as Te Puia (New Zealand Maori Arts and Crafts institute), where weaving and woodcarving is featured.