(CNN) -- Drainage tubes.
These aren't features typically associated with hotels, but the most interesting places to stay in Latin America somehow make them work.
This group of hotels goes a few steps further than turndown service and a free breakfast lineup to make your stay memorable.
Tubohotel (Topoztlan, Mexico)
Modeled after the funky Dasparkhotel in Linz, Austria, the Tubohotel has transformed 20 concrete sewer pipes into minimalistic hotel rooms.
Artfully arranged in groups of three, the pipes are 8 feet wide and 11 feet long and outfitted with a queen-sized bed, desk light and fan.
Claustrophobic or amenities-driven travelers need not apply.
Tubohotel, Tlacaltipac Glorieta Kilometer 17 S/N, San Sebastian, Tepoztlan, Mexico; +52 739 395 3613; from $31 per night
Costa Verde (Quepos, Costa Rica)
In the dense forest along the western coast of Costa Rica lies the body of an old Boeing 727.
It's not the ominous remains of a flight gone wrong, but rather a luxury hotel suite.
Dangling over the side of a hill amid a selection of more traditional accommodations, the fuselage of the vintage 1965 jetliner has been remade into a two-bedroom rental complete with dining area, sitting room and a small wooden deck for spotting the toucans, howler monkeys and other jungle creatures.
The fuselage that encases the two bedrooms of the "727 Fuselage Home" suite is intact.
Apart from the distinctive shape of the portholes and curved ceiling, however, the interior feels more woodsy bungalow than aircraft.
Costa Verde, about a half mile from entrance to Manuel Antonio National Park, Quepos, Costa Rica; +506 2777 0584; 727 suite from $250 per night
Encuentro Guadalupe Antiresort (Valle de Guadalupe, Mexico)
"Luxury cabin" sounds like an oxymoron, but not when you're talking about the 20 designer shelters that make up this Baja California retreat.
Each sparse but chic unit includes king-size beds, ceiling fans and floor-to-ceiling windows.
The hotel is positioned among craggy terrain, so it blends in with the landscape of this fertile wine-growing region just 90 minutes south of San Diego.
Encuentro Guadalupe Antiresort Ctra. Tecate-Ensenada, kilometer 75, Valle de Guadalupe, Mexico; +52 646 155 2775; from $175 per night
Lapa's Nest Tree House, Barrio Bonito, Costa Rica
With six stories, four bedrooms, and two bathrooms, Lapa's Nest just might be the world's coolest tree house.
Built 60 feet up around a towering guanacaste tree in the rainforest of remote southern Costa Rica, this arboreal perch offers guests unexpected luxuries like warm showers and air-conditioning, not to mention a bird's-eye view of the native wildlife.
Lapa's Nest Tree House, 13 kilometers north of Puerto Jimenez, Barrio Bonito, Costa Rica; +508 714 0622; from $1,850 per week
Unique Hotel (Sao Paulo, Brazil)
Other than its name, what makes this hotel unique is its shape.
The work of Ruy Ohtake, one of Brazil's most talented architects, it's been said to resemble everything from a boat to a slice of watermelon, but the construction was simply an ingenious way to get around the city's building-height codes.
Inside, it's not all that different from any other upscale property, except perhaps for the rooms' circular windows and an odd transparent, retractable wall between the bed and the bathroom.
Unique Hotel, Av. Brigadeiro Luis Antonio, 4700, Jardim Paulista, Sao Paulo, Brazil; +55 11 3055 4700; from $370 per night
Canopy Tower (Gamboa, Panama)
This 12-room lodge rising above the treetops of Soberanía National Park has an unusual origin.
It was built by the U.S. Air Force in 1965 as a radar tower to help in the defense of the Panama Canal, and was later used for everything from controlling air traffic to aiding in the war on drugs. Today, it's a hotel and nature observatory.
The rooftop deck offers a 360-degree view of the forest below.
It's popular with birders hoping to catch a glimpse of the bicolored antbird, blue cotinga and other species that reside in the forest canopy.
Canopy Tower Soberanía National Park, 35 miles north of Panama City, Gamboa, Panama; +507 264 5720; from $120 per night (three-night minimum)
Palacio de Sal (Potosí, Bolivia)
You may be tempted to lick the walls at this oddball hotel, but please refrain.
Especially if you have high blood pressure.
That's because the entire thing is made of salt.
Billions of tons of it, in fact, all of which came from the nearby Salar de Uyuni salt flat (the world's largest).
The unusual building material was used to construct the floors, ceilings and almost everything in between, including the beds and the property's nine-hole golf course.
Palacio de Sal, Salar de Uyuni, Uyuni, Potosí, Bolivia; +591 68420888; from $135 per night
Montaña Mágica (Panguipulli, Chile)
It's a trek getting to this 13-room retreat in the middle of the Huilo-Huilo Biological Reserve, but make it and you'll be treated to a vine-covered, volcano-shaped lodge with daily eruptions that spew water down the side of the property.
Step indoors and the woodsy theme will have you feeling like you're inside a hallowed-out tree.
Given the look and feel of the place, you might think you'd be surrounded by hobbits, but your neighbors are actually the pumas, pygmy owls and other creatures that make their home in the forest.
Montaña Mágica, inside Huilo-Huilo Biological Reserve, 530 miles south of Santiago, Panguipulli, Chile; +56 2 233 559 38; from $200 per night
Quinta Real Zacatecas (Zacatecas, Mexico)
One look at this luxury hotel and it's not hard to imagine its previous incarnation as the Plaza de Toros San Pedro, a bullfighting arena dating to the nineteenth century.
Forty-nine suites now reside where the grandstand once stood and the ring where the matadors once battled beasts is now a charming courtyard.
All of it has been remade to appease hotel guests while preserving the structure's classic colonial style.
Quinta Real Zacatecas, Av. Ignacio Rayón 434, Col. Centro, Zacatecas, Mexico; +492 922 9104; from $126 per night
EcoCamp Patagonia (Torres del Paine, Chile)
Glamping meets sustainability at this cluster of igloo-shaped suites that house visitors exploring the rugged Patagonian plains with adventure outfitter Cascada Expediciones.
The domes are designed to mimic the dwellings of the nomadic Kaweskar tribe that once inhabited the area
Green features include low-emission woodstoves and state-of-the-art composting toilets.
There's also enough electricity to charge your camera, so you can snap plenty of pics of the incredible Torres del Paine landscape.
EcoCamp Patagonia, Torres del Paine National Park, approximately 200 miles north of Punta Arenas airport, Torres del Paine, Chile; +56 2 2923 5950; call for rates