HEGIGIO GORGE PIPELINE BRIDGE - PAPUA NEW GUINEA
Technically, this is a bridge: it's a structure which spans a gorge. The only difference is, the bridge can't be used by humans due to the fact that its purpose is to support 2 pipelines - 1 gas, 1 oil - across the extremely high gap in Papua New Guinea. So high in fact that if this were to be officially recognised as a bridge it would rocket to the top of the 'world's highest bridge-span' list at an impressive height of 1'290ft. By comparison, the current highest bridge span belongs to the Royal Gorge Bridge in Colorado, hanging a mere 1'053ft above ground level, while Manhattan's ChryslerBuilding measures 1'047ft.