There once was an Irish city… You might think "naughty poem" when you hear the word Limerick, but in truth the city inspires so much more than just knowing giggles. Medieval castles and churches give the city a grand feel, while the pubs crawl with lively locals and students who are all craving just one more pint of Guinness. The Hunt Museum boasts a collection of pieces from history's most important and influential artists, while the Foynes Flying Boat Museum will marvel visitors of all ages with its whimsical flying machines.

Plan to cross many bridges when in Cork. Ireland's third-largest city began life as an island and now spans both banks of the River Lee, with watery channels running beneath some of its main thoroughfares. The best way to experience this hilly southern seaport is on foot, following the signposted walking tour past St. Finn Barre's Cathedral and the riverside quadrangle of University College up the hill to red and white Shandon Church. Along the way, you'll meet plenty of the city's talkative residents.

From Shoreditch’s swaggering style to Camden’s punky vibe and chic Portobello Road, London is many worlds in one. The city’s energy means that no two days are the same. Explore royal or historic sites, tick off landmarks from your bucket list, eat and drink in exclusive Michelin-starred restaurants, enjoy a pint in a traditional pub, or get lost down winding cobbled streets and see what you stumble across – when it comes to London, the possibilities are endless.

Amsterdam is truly a biker’s city, although pedaling along the labyrinthine streets can get a little chaotic. Stick to walking and you won’t be disappointed. The gentle canals make a perfect backdrop for exploring the Jordaan and Rembrandtplein square. Pop into the Red Light District if you must—if only so you can say you’ve been there. The Anne Frank House is one of the most moving experiences a traveller can have, and the Van Gogh Museum boasts a sensational collection of works.

Roman legions marched into what is now the Rhineland's largest city in 38 B.C. These two thousand years have produced a wealth of sites to visit, from Roman towers to Gothic churches to modern architecture. With a reputation as a fine art center, Cologne has museums running the gamut from the Museum of Applied Art to Museum Ludwig, home to works by Warhol and Picasso, to the Chocolate Museum. The city has an excellent bus, tram and train system, on which Kolner Tageskarte, Day Tickets, are valid.

travellers generally come to Bilbao to see the Guggenheim—some for the art inside, but many for the amazing building itself. The Fine Arts Museum and the Basque Museum may not have been designed by Frank Gehry, but are worth a visit, and you can catch international opera stars at the Palacio Euskalduna.

In progressive Berlin, the old buildings of Mitte gracefully coexist with the modern Reichstag. Don't miss top historic sights like the Berlin Wall, Checkpoint Charlie, the Brandenburg Gate and Potsdamer Platz. The city's great zoo makes for a fun break from touring the staider attractions.

The town that gave the country (and port wine) its very name, Porto is Portugal’s second-largest metropolis after Lisbon. Sometimes called Oporto, it's an age-old city that has one foot firmly in the industrial present. The old town, centered at Ribeira, was built on the hills overlooking the Douro River, and today is a UNESCO World Heritage Site. The 14th-century São Francisco church is a main attraction, as are the local port wine cellars, mostly located across the river at Vila Nova de Gaia.

One of Poland’s most beautiful cities, Gdansk, on the Baltic Sea, has played major roles in history, especially in the 20th-century. It was the 1939 flash point of World War II, and then in 1980, the birthplace of the Solidarnosc labor movement, ushering the end of Communist domination in Eastern Europe. Gdansk’s Old Town, painstakingly reconstructed to its Hanseatic League glory after being leveled in World War II, is a highlight. The 14th-century Town Hall houses the city’s historical museum.

With attractions and activities galore, Chicago is everyone's kind of town. See all the famous sights, then go to a show in the theatre district or a Cubs game at historic Wrigley Field, followed by a late-night visit to a blues club or jazz bar. Culture hounds will delight in the multitude of museums, including the prestigious Art Institute and the Chicago Historical Society. Families will find plenty to do at Navy Pier and plenty to explore at the Field Museum and the Lincoln Park Zoo. You could spend all day strolling through Hyde Park or shopping along the Magnificent Mile. Discover vibrant ethnic neighbourhoods, architectural landmarks, delicious food and world-class hotels. From the top of the Sears Tower to the shores of Lake Michigan, Chicago offers so much to do, visitors keep coming back for more.