1. Matera, Italy, the third oldest inhabited city in the world.
"Matera, also known as the 'Subterranean City' is one of the oldest inhabited cities in the world, and UNESCO World Heritage Site since 1993. The ancient town was inhabitable until the late 1980s, but is now refurbished by the government and used as hotels, bars and other businesses. Never has a walk through any town been this adventurous and full of mystery. Once you get in, you don’t know where you will find an exit from the maze." —Jess Roe
2. Longyearbyen, Norway; it isn't known for its museums, but there's plenty to see.
"This Norwegian settlement is considered the world’s northernmost town. You can merge with nature here, admire fantastic views, and discover lots of interesting things. This city doesn’t have famous museums, monuments, or galleries, but it has mighty hills, century-old glaciers, and polar inhabitants. You can even cross the Polar Circle, experience the polar day or night, and visit abandoned villages such as Pyramiden." —Oleksii Shumaiev
3. Zell am See, Austria, the perfect place for people who like outdoor activities with a view.
"Try to imagine a town in the Austrian Alps that's built on a crystal clear lake. It has year-round skiing, and it's a hiker’s paradise." —Thomas L. Johnson
4. Sevilla — a must if you're visiting the south of Spain.
"There are so many treasures in southern Spain, but Seville is a great place to start or end a trip to Andalusia. It has Moorish remnants and a wonderful historical district." —Thomas L. Johnson
5. Budapest, Hungary, an inexpensive, safe, beautiful alternative to Prague.
"Budapest is absolutely beautiful, fairly inexpensive, safe, and easy to travel around. A delightful city that is often overlooked in favour of the more popular Prague. If you go, try to book a tour of The Hungarian State Opera House, it's an exact copy of the Vienna Opera House. Book tickets for a performance if you can, very inexpensive, but it's a fabulous experience!" —Grainne O'Reilly
6. Llandudno, Wales, a magical place with a strong connection to Alice in Wonderland.
"I just love this town for some reason, as did (presumably) Lewis Carroll. The beach at low tide is a wonderful place to stroll. The activity on the streets are very relaxed as you would find at a resort. Exploring the Great Orme is always a treat, especially when you use the Tramway." —Louis Juliot
7. Trier, a German city full of old charm.
"Trier is Germany’s oldest city. It's picturesque, historic, and just plain beautiful. I was fortunate to be sent here by the Fulbright Commission and will forever be in their debt." —Thomas L. Johnson
8. Lucca, Italy, a gorgeous city with fewer tourists than neighboring Pisa.
"A walled city that has all of the charm of nearby Pisa, without the crush of tourists." —Thomas L. Johnson
9. Arles, France, inspired many of Van Gogh's creations.
10. York, England, perfect for English history enthusiasts.
"I love English history, and York has it in abundance. The Minster, the medieval motte castle, the gorgeous 'Shambles' Tudor-style shopping streets. What’s not to love?" —Wendy Moncur
11. Uppsala, one of Sweden's major cities, and just a quick train ride away from Stockholm.
"You would never get tired of Stockholm, but if you do, a short trip to Uppsala will bring you to a wonderful Nordic city with a great history." —Thomas L. Johnson
12. Ljubljana, Slovenia, offers visitors great street markets and river kayaking.
"There is nothing more festive than a fall day in the capital of Slovenia. With its active streets and markets, it's a great place to experience one of the newest Euro nations." —Thomas L. Johnson
13. Bremen, a German city that inspired a (Grimm) fairy tale and serves great food.
14. Belgrade, Serbia, will take you by surprise.
"Belgrade highly surprised me. The views from the Fortress are amazing. I need to go back to investigate the city a little bit more, but it’s one of the places in Europe that really surprised me." —Millia da Silva
15. You might not need to get a visa when visiting Minsk, Belarus, making your travels 100 times easier.
"Minsk is amazing! It's has cheap plane fares and hotels, interesting historic landmarks worth visiting, and as of recently, citizens of many countries can visit for up to five days without a visa." —Cameron Kandahar
16. Annecy, France, an alpine town with a gorgeous backdrop and a crystal clear lake.
"In France, I would suggest Annecy. It's a beautiful town close to the Alps with a lake, and a lively old city centre. Great food too!" —Quora User
17. Luxembourg City, a gorgeous place with delicious gastronomy, but not for those traveling on a budget.
"Yeah, it's expensive and full of EU bureaucrats, but culturally distinct and full of history. Quite picturesque, with fantastic food and wine." —John Miele
18. And in Naples, Italy, you'll find a little bit of everything without having to pay tourist prices.
"Great food, friendly people, UNESCO world heritage site old town, the most beautiful chaotic narrow old streets you can imagine. It also has great museums, bars, and it's close to Pompeii, Vesuvius, Amalfi coast, and Capri. It's also not overpriced, and did I mention the food?" —Duncan Metcalfe