Kilkenny is over 400 years old, but it sure doesn’t show its age. Yes, it's an awe-inspiring throng of medieval cathedrals, castles, abbeys and other massive stone buildings, but Kilkenny loves to party. An endless stream of arts festivals celebrating theater, comedy, bluegrass and dance is constantly pumping the city with new life, toe-tapping energy and international flavor.

From the bustling charm of Galway City to the rugged, otherworldly Burren, Western Ireland offers a wonderful wealth of experiences. Exuberant Galway, City of Tribes, packs summers with festivals and packs pubs with locals and visitors. Westport is another charismatic town, full of colourful shopfronts, pubs and great restaurants. The near-lunar landscape of the Burren delights with its unexpected flora. Don't miss its Stone Age burial monuments, fishing village Ballyvaughan or cheerful Lisdoonvarna.

Tenby is lovingly protected from the outside world by an embrace of 13th-century stone walls, which, ironically, attract—not repel—visitors from all over the world. The town is simply adorable, teeming with the archetypes of pubs and shops one would expect to find in a U.K. city. Adding further appeal are the miles of gorgeous beaches and the gently lapping waves of a blue-grey sea.

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.

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.

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.

Colmar is a photographer's dream, with its labyrinth of cobbled lanes, flower-lined canals, and timber-framed houses painted in a rainbow of pastel hues. It's the quintessential Alsatian town, brimming with traditional restaurants and surrounded by vineyards and medieval castles.

A coastal town just 20 miles west of Lisbon, Cascais was once a small fishing village, but its idyllic scenery attracted the attention of artists, writers and expelled European nobility in the 20th century. Today, it still attracts high society, but all society comes in force to enjoy the gorgeous beaches and adventure options like sailing and surfing. The Conde de Castro Guimarães Museum, a former palace, is now open to the public and displays an impressive collection of art and artifacts.

It’s nicknamed the Eternal City for a reason. In Rome, you can drink from a street fountain fed by an ancient aqueduct. Or see the same profile on a statue in the Capitoline Museum and the guy making your cappuccino. (Which, of course, you know never to order after 11 am.) Rome is also a city of contrasts—what other place on earth could be home to both the Vatican and La Dolce Vita?

Corfu is studded with whitewashed houses, Byzantine churches, and the remains of Venetian fortresses and Greek temples. Wander the ancient streets of the Roman village of Kassiopi or explore the central Esplanade of the eponymous Corfu Town. For a DIY spa experience, lather yourself in mineral mud on the shore of the Canal D’Amour. Legend has it that the waterfalls of Nymphes used to attract the mythological beauties of the same name, who would flock to the village to bathe in the pristine waters.

Culebra is somewhat of the anti-tourist destination, harbouring no large hotels or flashy holiday bells and whistles. The beaches are stunning stretches of white sand, great for sunning, windsurfing and diving. The culture and architecture are just as colourful as the waters of the bright blue sea. Stroll around downtown for a truly quaint afternoon activity.