<blockquote>Villagers in Meghalaya, India have come up with a unique construction technique that harnesses nature in its purest form - they grow their own living bridges! Using the roots of the Ficus elastica tree (rubber fig tree), the residents have woven an elaborate system of living bridges, some of which are thought to be over 500 years old. These extraordinary examples of living architecture are also lessons in patience, since they take about 15 years to grow. With age though, the <a href="http://rootbridges.blogspot.com/">living root bridges</a> grow stronger and can often support the weight of 50 or more people at a time!</blockquote>
via <a href="https://inhabitat.com/extraordinary-living-bridges-are-made-of-growing-roots-and-vines/">India's Amazing Natural Bridges Are Made of Living Roots and Vines</a>.