Incredible footage shows Chinese engineers building a colossal 2,618ft long bridge on two cliff faces over a remote river valley

The four-lane bridge has a 2,559ft span over Lvzhijiang River in China's Yunnan

Its tower topped out at 512ft on Tuesday, marking a breakthrough for the project

The structure is the world's largest single-tower, single-span suspension bridge

It is a key part of an expressway to link a remote region to the rest of the country

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