Worlds Awesomest Tunnels

Tunnels, whether bored through imposing mountains or laid hundreds of feet under water, are inspiring feats of engineering. Here, PM presents a collection of the world's most interesting and impres.Life aboveground is crowded. As engineers and architects grapple with innovative ways to meet the needs of roads, superhighways and bridges to handle unprecedented traffic. But sometimes, going underground is the only option. Tunnels, whether bored through imposing mountains or laid hundreds of feet under water, are inspiring feats of engineering.Here, PM presents a collection of the world's most interesting and impressive tunnels.