World's Most Coolest TreeHouses Design, part -2
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#10 Treehouse in Seattle (USA)
#11 Free Spirit Sphere Treehouses (Canada)
#12 Senior Center Turned Treehouse (Ghent, Belgium)
#13 O2 Treehouse (USA)
#14 Treehouse for Birds and People (Andu Momofuku Centre, Japan)
#15 Eco-friendly Finca Bellavista Treehouse (Costa Rica)
#16 Plane Treehouse (Costa Rica)
#17 Teahouse Tetsu (Yamanashi, Japan)
#18 UFO Treehouse (Sweden)
#19 Roost Treehouse