The Enchanted Forest in British Columbia, Canada--I must go here. And yes, I know this isn't in Europe
Absolutely could live here
Awaken your inner child by sleeping in a tree house at Parc Aventures Cap Jaseux in Quebec, a unique ecotourism adventure centre.
the world's best tree houses - Google Search
The Enchanted Forest, Revelstoke, Kootenay Rockies
Animal Planet has designs for Treehouse Masters | NWAonline
Family Builds Amazing Treehouse - Home and Garden Design Ideas
Living the Highlife Tree House. A luxurious tree house project by Blueforest team from the UK. The castle features two lofty spaces: one for the children and another for the adults.
.ஜ۩ஜ Is this for the birds
Fairoaks at work in a beautiful beech tree outside of NYC. Pete Nelson, The Treehouse Guy.