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18 of the world's most stunning treehouses

March 18, 2011, 1:25 p.m.
4Treehouse

Photo: NK/Lukasz Kos

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4Treehouse

When Lukasz Kos designed 4Treehouse, he wanted it to be an exercise in minimizing the impact on the trees, the building site and nature itself. With this in mind, the two-ton lattice-frame structure was suspended 20 feet above the forest floor with steel cables, and the treehouse is anchored to the tree trunks with just one puncture hole in each of the four trunks. Visitors to the unique structure at Lake Muskoka in Ontario, Canada, enter the two-story structure via a rolling staircase.