Some of the boldest civil engineering on the planet is invisible from the surface. Crews have driven rail and road tunnels ...

Add Yahoo as a preferred source to see more of our stories on Google. Allegheny Mountain tunnel open to traffic while repairs are made The westbound side of the Allegheny Tunnel of the Pennsylvania ...

The 134-year-old Lapstone Hill Tunnel was used to store munitions in World War II and later became a mushroom farm. Now there are calls to make it a link between two towns in the Lower Blue Mountains.

Add Yahoo as a preferred source to see more of our stories on Google. SOMERSET, Pa. – Pennsylvania Turnpike Commission officials outlined their 4.8-mile plan Thursday to cut a new, “safer” section of ...

The 16-foot-diameter San Jacinto Tunnel runs 13 miles through the mountain. While shut down for maintenance, the tunnel has a constant stream of water entering from the mountain. Thousands of feet ...

Earlier this month, thousands of people signed up to go underground and explore Lapstone Hill Tunnel – a hidden piece of Blue Mountains history which, all going well, could become a pretty epic new ...