When most people think of a treehouse, they usually picture a shabby structure held together with a few nails and a parent’s hope that it doesn’t come crashing down. Then there are the people who think bigger, who grew up wishing they could live in the treetops like Peter Pan’s Lost Boys or The Swiss Family Robinson. These are the ones who have been stretching the commonly-held notion of a treehouse to create magical and awe-inspiring designs, like the 11 below. Some of these are single rooms and some are just concepts, but they all bring civilization back to nature in beautiful and whimsical ways.