In the state of Meghalaya, India, villagers have been directing tree roots and vines to ‘build’ bridges for 500 years. By using hollowed out tree trunks, they guide these plants to the other side of the river and allow them to take root. These bridges are more than 100-feet long, and can support 50 or more people, though they take more than 15 years to become fully functional. The natural solution was to use the surrounding plants as they would strengthen over time. As an added bonus, the bridges give the surrounding landscape beauty with its latticework patterns.