If you find yourself in Rotterdam, there's a strong chance you've arrived by water. This popular port city (the second largest in the Netherlands) has gone through an architectural renaissance since World War II, with daring, innovative structures dotting the city (cube houses!) and defining its skyline. Café culture is on the rise here, so grab yourself a table and a cup.

Antigua, Guatemala's prized colonial monument, is just an hour from Guatemala City, and a pleasant alternative to staying in the capital. Good walking shoes are needed for its cobblestone streets. The most spectacular time to visit is Holy Week, when processions walk on handmade sawdust carpets with beautiful floral and geometric designs.

Set on the Adriatic Sea, Zadar, Croatia, is a major Dalmatia historical center and a tourism magnet. Walk ancient streets, see Roman ruins and enjoy white-sand beaches.

Pinhão, nestled in the heart of Portugal’s Douro Valley, is a small town with a big reputation for its world-renowned port wine and stunning landscapes. Surrounded by terraced vineyards that cascade down to the banks of the Douro River, Pinhão is a paradise for wine lovers and nature enthusiasts alike.

Warnemunde (or Warnemünde) is a port city in Germany and a frequent stop on many Northern European cruises. Across the Baltic Sea from Denmark's capital, Copenhagen, this charming seaside city has a number of delightful attractions, including the Warnemünde Lighthouse, a variety of local shops along the marina, and surfing lessons on the beach.