theconstructor.org/structures/history-of-bridges/5491/
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The first bridges were believed to be made by nature — as simple as a log fallen across a stream. The first bridges made by humans were probably spans of wooden logs or planks and eventually stones, using a simple support and crossbeam arrangement. The Indian Epic literature Ramayana provides mythological accounts of bridges constructed from India to Sri Lanka by the army of Sri Rama, the mythological King of Ayodhya.
Mention of bridges being constructed by Mauryan dynasty in India, is given in Kautilya’s “Arthasastra”. During the wars Mughals have constructed many bridges across major rivers, in India. Before pre-historic people began to build the crudest shelter for themselves they bridged streams. Trees that have fallen across the stream from bank to bank acted as bridges. The wandering tribe that first deliberately made a tree fall across a stream were the first bridge builders. Observing monkeys swing of the several vines, led to connecting parallel cables with some sort of cross pieces, to support as bridges. Later hand grips were proved which led to suspension bridges.
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