architecture: Octagon "treehouse"

 RARE 700 sqft TINY OCTAGON TREEHOUSE CABIN w/ hot tub & 2 fire pits! - YouTube

Beach Lake, Pennsylvania

the tree house, by camp caitlin - Cabins for Rent in Beach Lake, Pennsylvania, United States - Airbnb

the tree house, by camp caitlin - Cabins for Rent in Beach Lake, Pennsylvania, United States - Airbnb

and another, in Otis, Massachusetts

Berkshire's Octagon Glass House Tour | Stunning Massachusetts Cabin Rental - YouTube

Octagonal Glass Treehouse Berkshires Getaway In Massachusetts

the Cabinpedia — DIRTANDGLASS

and another new design

The Octagon House - YouTube