The interior of one of Collective Retreats' Summit Tents is shown, on Governor's Island, in New York harbor, Tuesday, July 3, 2018. Credit: Richard Drew | AP

At one point in the mid-2010s, “glamping” became a four-letter word.

A sudden boom in upscale tented accommodations — which ultimately felt neither glamorous nor like camping — saw the trend go from boom to bust as quickly as spaghetti doughnuts and ramen burgers.

But now, glamping is back, and the glamour factor is through the canvas roof.

[Maine campground takes ‘glamping’ to a new level]

Everywhere from Luang Prabang to New South Wales, Tulum to Costa Rica — even in the heart of New York City — hoteliers are ditching bricks and mortar walls and ceilings for safari-style tents, many with free-standing bath tubs, fireplaces, wood floors, and outdoor dual-head rain showers. The concept has become so high-end, “glamping” no longer does it justice.

For travelers, the experience offers novelty, digital disconnection, and access to experiences that are at once authentic and Instagrammable (when you get back on Wi-Fi). Think interacting with rescued elephants in northern Thailand at Four Season’s Golden Triangle tented camp or hot air ballooning over the Rocky Mountains from the Resort at Paws Up, in Montana.

“Kids love it. It’s great for multi-generational trips,” said Jack Ezon, president of Ovation Vacations. “It’s a completely different experience.” He says clients come to him with tented properties on their bucket lists — or simply looking for something “different” and outdoorsy.

Just don’t expect these trips to come cheap.

“We’ve seen some of our tents going for $5,000 a night,” said Luca Franco, founder and chief executive of Luxury Frontiers, a soup-to-nuts design firm and consultancy that specializes in ultra-high-end tented camps such as Abu Camp and Eagle Island Lodge, two iconic properties in Botswana. Among his upcoming projects: A One&Only resort in Riviera Nayarit, Mexico; a private island in the Maldives; and a tented village in Utah. At all of them, guests will pay a premium to camp out under the stars. With butler service, of course.

When Franco got into the luxury tent business, the market was concentrated in Africa’s game parks. “All I knew was that 50 to 70 percent of the guests at the top-tier safari lodges in Africa were coming from the U.S,” he said. That signaled to him that the safari-style concept might have legs in other naturally pristine destinations.

“I saw a lot of demand and little supply,” Franco explained. And as the market for eco-sensitive and off-the-grid vacations has spiked, tented camps have benefited even more.

[Blog: Here’s why you should camp, not glamp]

Franco and his contemporaries have converted that demand by thinking of these projects not just as fancy tents, but as conduits to unique experiences. “We flip the concept of designing the box and filling it with activities,” he said. “Instead we design the activities first and then design the box around that.”

At the upcoming Shinta Mani Wild, on the border of Cambodia’s Cardamom National Park, guests will be able to eat at a restaurant tucked under a waterfall and zipline into the resort before sleeping off their adventures in Jackie O-inspired tents. It opens this December. At the One&Only in Riviera Nayarit, coming in 2020, guests will practically be able to roll out of their beds and onto a horse for sunset rides on a white, powdery beach. And when it opens next fall, Nayara Tented Camp in Costa Rica will offer budding conservationists an up-close look at the country’s dwindling sloth population.

“I grew up as a kid going camping,” recalled Nayara’s owner and mastermind, Leo Ghitis. “At this stage in our lives, we like the nostalgia of camping but with all the conveniences and luxuries.”

At his property that will mean hot springs-fed plunge pools on each private deck, interiors that fuse English and Spanish colonial styles, and closets so large that Paris Hilton could waltz in and feel right at home. Plus, he said, “The royal families of the Middle East typically have homes in ultra-luxury tents-so clearly there is something to it.”

Why they’re (mostly) great for business

According to Franco, the master tent-builder, hoteliers who invest in tented projects can expect to generate 20 to 40 percent more in revenues than their six-star bricks and mortar counterparts, and construction costs can be up to 50 percent less-particularly in cases where the tents are just one part of an existing resort that’s already established all the necessary infrastructure. Even still, that doesn’t make these camps affordable or easy to build.

“We are in the luxury or beyond-luxury categories,” explained Franco, “so everything has to be truly custom.” When one leading hospitality brand asked him to design a tent that could be replicated in Turkey, the Bahamas, Marrakesh, and Mexico, he said no: “All these places have different climates. There’s no wind in Turkey, but in Holbox, Mexico, the wind is very strong; in the Bahamas you need tents that can be completely removable for hurricane season, in Tulum you need something fit for the jungle, and in Morocco you have extreme heat to deal with.”

Catering to these varying weather patterns — plus consumers who might need family-friendly setups — can add up to a lot of costly customizations. As a result, Franco’s tents can cost between $50,000 and $1 million each. Plus, exposure to the elements means they need to be carefully maintained and replaced every few years.

Of course you can spend less (and charge less). Look no further than Collective Retreats, a brand built on simpler glamping principles with locations in Yellowstone National Park and Governor’s Island with views Manhattan’s Financial District. Its tents start at $150 per night.

In Australia, Sierra Escape, Nashdale Lane, and Bubbletent are all new concepts that are less full-service hotel, more unconventional accommodations that you can book for less than $300.

“We wanted to do something completely different, and immerse guests in the environment without taking away the luxury,” said Cameron D’Arcy, co-founder of Sierra Escape, a three-tent camp in New South Wales. As a marketing professional, he says the concept is a no-brainer: “Thanks to the Instagram appeal, the product almost markets itself.”

As much as the mid-range glamping resort is thriving, it’s the ultra-high-end proposition that’s truly resonating with travelers.

Sonny Vrebac, co-owner of Bubbletent-a property overlooking Capertee Valley, the world’s second-largest canyon-says he’s learned that the hard way. He created three different types of tents, one fancier than the next, only to diagnose himself with what he calls the “grand cru Champagne problem.” He gets disproportionate demand for the highest-end of the bunch, a bubble with both climate control and its own outdoor wood-fired hot tub.

Back in Costa Rica, Nayara’s Ghitis shouldn’t have that problem. “I’ve already blown my budget 10 times,” he joked, saying he’s working towards creating the most luxurious tented camp in the world. “But if what you were looking for was to maximize profits, you wouldn’t be building a tented camp. You do it because you’re thinking about legacy.”

Follow the Bangor Daily News on Facebook for the latest Maine news.