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Nelson describes this 450-square-foot treehouse as a "chalet-style fairy-tale aerie." The owner especially loves that a ramp, rather than the traditional ladder or stairs, lead to the house.
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A more modern treehouse hangs off the side of a western red cedar. This treehouse was started during a five-day workshop at the Northwest Treehouse School, which Nelson also runs.
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Everyone should have access to a treehouse! At least that's what the people behind Forever Young Treehouses believe. Using volunteers, they have built 19 U.S. treehouses, all of which comply with the American Disabilities Act.
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Nelson found this treehouse through his partner Jake Jacob. It was designed with a Native American theme (note the teepee-like roof) and is made almost entirely of salvaged or reclaimed materials.
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A classic treehouse designed by Dan Mack. In his book "New Treehouses of the World," Nelson writes, "This is the kind of place I dreamed about as a kid."
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Nelson isn't the only treehouse specialist in the world. Ricardo Brunellie, Brazil's preeminent treehouse builder, built this house about 300 miles west of Sao Paulo.
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This treehouse by Japanese builder Kobayahsi Takashi was constructed with the express purpose of communicating with outer space. "A sparkling beacon among treetops, it is easy to imagine the dome succeeding at its mission to make contact with alien life," writes Nelson.
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This two-level timber dwelling in the Gandoca-Manzanillo Wildlife Refuge, on the southern Caribbean coast, owes its existence to the green iguana. It was built by an amateur botanist who runs a breeding and research station there for the endangered species
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A three-storey structure with two double bedrooms in a tamarind tree overlooking the beach near the city of Sanya on the island of Hainan. It was devised by entrepreneur David Greenberg based in Hawaii - Hainan is twinned with Hawaii - and the name reflects a magic mushroom-induced moment he enjoyed in 1972.
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An eco resort with two treehouses set in 500 acres of rainforest high in the mountains. Occupying enormous ficus trees - inspiration was taken from local Paniya herdsmen's platforms - access is by water-powered lifts
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Built by artist Mikael Genberg, the Hackspett (Woodpecker) is suspended high in a 350-year-old oak tree. Inside, there's a single bed, hammock, kitchenette and toilet, with an outside balcony to enjoy the views. Access is by rope, and food is also winched up
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High in the thick foliage of a century-old mango tree with views over the Caribbean Ocean, access is by a timber spiral staircase
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There's a double bed, toilet, running water and electricity and a balcony large enough to swing a hammock. Walls are waist high, allowing 360-degree views.
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A double-deck treehouse built to make the most of the stunning scenery in Gifford Pinchot National Forest: views of the Sawtooth Range and Mount Rainier, as well as meteor showers. Sleeps five and has a sun room and kitchen
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The octagonal observatory, linked by a bridge to the house, is equipped with telescope and binoculars for star-gazing.