Owners, Britta and Kent Lindvall invited designers and architects to create a series of unique tree houses that reflect -- in some cases literally -- the growing popularity of ecologically-themed holidays.

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Getting its name from the sassafras tree root originally responsible for its unique flavour, root beer was an exclusively North American beverage until recently.

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Dr White has identified ten microsatellite markers that can be used to build up a unique genetic profile of the individual tree.

ECONOMIST: Telling the wood from the trees

Recently reclaimed by Historical Woods of America, this amazing horse chestnut tree has provided the wood for a rare and unique creation by William Henry.

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Even minor characters, from the worldly lesbian that runs April's apartment building, to the hoverchair-bound cyperpunk that lives by the dockside, to the tense-scrambled time-unhinged being that lives in a stone tree in the center of Arcadia, each have their own unique and rich personalities and histories.

CNN: Review: The Longest Journey

Once the sole province of young boys and Ewoks, tree houses offer adventurous travelers (read: unafraid of heights) a unique travel experience in an age of roadside motel chains and globe-stretching hotel corporations.

CNN: 7 deluxe tree-house hotels