Katie Hunt, writing for CNN
Unlike bridges made from wood or bamboo, they aren't easily swept away and they don't rot -- a common problem in what is often described as the world's wettest region. They've also proven more durable than bridges made from modern steel structures that quickly rust and decay in the damp climate, said Ludwig.
"It's an ongoing process of growth, decay and regrowth, and it's a very inspiring example of regenerative architecture," he said.
The bridges are made and maintained by individuals, families and communities from the indigenous Khasi and Jaintia people.
Also, here is another article by Timoty Allen - ‘Living Root Bridges’