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Leonardo self supporting bridge

Da Vinvi bridge is one of the most famous and masterpiece inventions in history. It was, after all, the first-ever self-supporting bridge. DaVinci bridge was designed while he was under the patronage of Cesare Borgia

How to build a da Vinci bridge
To build the bridge, Leonardo used a method that had never been used before: he laid out his design and then used ropes attached to pulleys to raise each stone block (or log) into place at once. This process required careful coordination with other workers and experts who helped him test each block’s stability before moving on to assemble the rest of the materials needed to build the bridge.
You can build a da Vinci bridge by yourself with simple materials, such as a pencil or toothpick. But you need a plan and also need to follow da Vici bridge instructions like the image.

Why was the self supporting bridge needed?
It requires no specific skills to manufacture the parts, apart from a few men that are handy with an axe, da Vinci bridge can also be carried by a handful of men into any battlefield. It requires no nails or ropes to hold it together and the bridge is self supporting and would be capable of holding a substantial amount of weight.
Leonardo da Vince self supporting bridge a remarkable feat of engineering. Though it was never completed, the design was sound and would have been a functional bridge. Da Vinci design was ahead of its time and demonstrated his genius as an engineer.