Expedia.com analyzed thousands of data points this year to identify the top trends in travel for 2018, and the results show that American travelers are increasingly interested in novel experiences – places less visited and the unusual activities they bring. Highlights from the report include the rise of secondary destinations like Chiang Mai, the Azores and Cartagena, and non-traditional lodging options such as tentalows and houseboats.

In the activities and attractions space, observation decks and architectural landmarks saw the biggest growth, with cooking classes and other culinary experiences close behind.

“In this day and age, it’s possible to have the exact type of experience and trip you want, whether it’s visiting a breathtaking island off Portugal, or staying on a family farm where you can gather your own fresh eggs in the morning,” says John Morrey, SVP Brand Expedia. “Being able to meet the needs of every kind of traveler is our driving force at Expedia, and why we strive to make it easy and affordable to find the perfect accommodation for any trip and bundle it with flights or car for even more savings.”

2018 in Travel: The Year of the Secondary City

In crunching the flight data from 2018 to determine the destinations seeing the most year-over-year growth, and it was clear that U.S. travelers are venturing beyond the primary tourist stops to seek out the culturally-rich offerings of secondary cities. Here are some of the most noteworthy trending destinations for 2018, all of which saw double- or triple-digit growth from last year:

Portugal: Azores

It’s no secret that Portugal had a major moment in 2018, seeing big boosts in tourism throughout the year. But it wasn’t just Lisbon and Porto attracting crowds – the Azoresalso wooed tourists with its dramatic landscapes and world-class diving and hiking.

Thailand: Chiang Mai
Chiang Mai, Bangkok’s more laid-back and spiritual sibling, is home to hundreds of Buddhist temples, incredible street food and historic festivals. Visit in November to launch a fire lantern during Loi Krathong, or in April to see the city come alive for Songkran.

United Kingdom: Inverness and Belfast
London remains one of the top global destinations in the world, but flight data proves travelers are venturing farther into the UK to Northern Ireland and Scotland.

Malta: Valletta
For those craving a beautiful Mediterranean getaway without the high prices of the French Riviera or crowds of the Italian coast, Malta could be just the ticket. Its capital city of Valletta, an UNESCO World Heritage site, is surrounded by water and features carefully restored and preserved monuments dating back to the late Renaissance.

Alaska: Kenai and Kodiak
The Emerald Isle of Kodiak, with its immense National Wildlife Refuge, and Kenai’s legendary salmon fishing are proof that there’s more to Alaska than just Anchorage and Juneau. For visitors looking to experience the best of Alaska, many of the highly-rated cruises will stop at three or four port towns.

Australia: Brisbane and Perth
U.S. travelers embarking on the 14+ hour journey to Australia are clearly seeing more than just Sydney’s iconic Opera House. Queensland’s capital, Brisbane,and Western Australia’s Perth both appear on the trending destination list this year.

Ecuador: Cuenca
Ecuador’s capital, Quito, and the Galapagos Islands are both popular tourist destinations, but this year Cuenca saw increased demand. Perhaps word is getting out that its historic city center, an UNESCO World Heritage Site, and array of street markets are just as worthy of a visit.

Croatia: Zagreb
Zagreb may be Croatia’s capital but from a western tourism perspective it’s been playing second fiddle to coastal Dubrovnik for a few years now. But U.S. travelers are starting to take notice of Zagreb’s urban appeal, lighter crowds and affordable prices.

Colombia: CartagenaQuite different in terms of climate and personality than the capital city of Bogotá, Cartagena is rich in colonial charm.

Spain: Seville
For those looking to experience real Spanish culture, Seville will not disappoint. Less touristy than popular Barcelona, locals would tell you Seville is where to find authentic flamenco and tapas.

While traditional resorts and hotels continue to be a favorite for U.S. travelers, Expedia’s data shows a growing interest in alternative lodging options. Here are some of the fastest-growing accommodation types to watch:

Tentalows (cross between a tent and a bungalow) – up 135 percent year-over-year

Chalets – up 85 percent year-over-year

Villas – up more than 45 percent year-over-year

Agritourism properties – up more than 40 percent year-over-year

Houseboats – up more than 35 percent year-over-year

Top trending activities include observation decks and culinary experiences

Activities and experiences are increasingly popular as travelers look to personalize and customize their vacations. These are the fastest-growing activity categories for the U.S.:

Fastest-growing category: Attractions. Observation decks and architectural landmarks are leading the pack, with the Eiffel Tower, Rome’s Colosseum, the 360 Chicago Observation Deck and the High Roller Observation Wheel in Las Vegas among the top trending attractions.

Runner-up: Tours & Sightseeing. Walking and hop-on-hop-off bus tours remain popular among travelers visiting big cities.

Third place: Shopping & Culinary Experiences round out the top categories, as travelers look to get the most out of their destinations and sample local flavors.