This crazy treehouse, available at The Well Appointed House, might just be the craziest thing I have ever seen.
The outside of this extreme treehouse features Jacket Board siding, which creates a log cabin look. The inside is finished, the walls are insulated and there were 6 double pane, tempered glass windows.
If you are interested in getting one of these Extreme treehouses, you need to contact the company so that they can check on log supplies. Their website says they will quote prices upon request.