In 2005, the world’s largest all-wood treehouse was built amongst the lime trees of the Alnwick Garden in Northumberland County, UK. Alnwick Gardens can be reached from the A1 approximately 50 miles north of Newcastle. This 6,000 square foot treehouse is comprised of walkways, cottages, shops, a restaurant, and play areas. There is an expansive deck area and rope bridge loop behind the house, all of which can be accessed by wheelchair.

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Dominating the skyline of Arkhangelsk, a city in Russia's far north-west, it is believed to be the world's tallest wooden house, soaring 13 floors to reach 144ft - about half the size of the tower of Big Ben.

The house that Nikolai Sutyagin built is also crumbling, incomplete and under threat of demolition from city authorities determined to end the former convict's eccentric 15-year project.

When Sutyagin began work on his dacha in 1992, he claims he was only intending to build a two-storey house - larger than those of his neighbours to

Wow! From the outside these houses look like they would be fun to live in, but inside they are pretty austere--not very homey--and not easy to climb around in. So I probably couldn't live in one without renovating the stairs, but it would be fun to see these architectural curiosities in person!