The Gibbon Experience Treehouse, Bokeo Reserve, Laos "The tree houses erected by conservation group Animo are a thing of architectural wonder, straddling the giant trunks of strangler fig trees. But more extraordinary still is that to reach these vertiginous eyries you’ll have to trek through the fecund realm of the tiger, then catch a series of exhilarating zip lines strung across the forest canopy, before flying into your night’s accommodation."