Sorry we buried it so quickly, esp. as the email feedback had been so great....but for those who missed our next most recent post of the airbnb.com treehouse inn- you can find more here... http://www.airbnb.com/rooms/13037 (or scroll down further below)
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John Aber, after seeing some recent posts on treehomes/treehouses/treeforts here on relaxshacks.com, sent us this photo: Its a treehouse in Nicaragua/Central America, where after ascending several steps, you actually enter the structure by climbing INSIDE and through a hollowed out section of the tree.
-Derek "Deek" Diedricksen