In 2005, the world’s largest all-wood treehouse was built amongst the lime trees of the non-profit Alnwick Garden in Northumberland County, UK. This 6,000 square foot treehouse is comprised of walkways, cottages, shops, a restaurant, and play areas. It is even wheelchair accessible, and holds close to 1,000 people, so everyone can play.

The Treehouse from Outside:

The treehouse’s wooden suspension bridge:

Inside the treehouse (fireplace, gift shop, restaurant):

It takes a lot of support to hold up the treehouse:

If you have kids, you may want to wait until they’re older and tired of treehouses to take them to Alnwick. Otherwise, you can be certain their current playset or treehouse will never be used again.

Thanks to Alnwick Garden, Chung-tung Yeh and fatcontroller for most of these pictures.

LATE UPDATE:

Since a lot of you feel strongly about the definition of a treehouse, I’ve added a quick poll. My vote is that it’s a treehouse since it’s suspended off the ground and amongst the trees, but I’m looking forward to your votes: