PITTSBURGH — The Liberty Tunnels Ventilation System in Pittsburgh has been recognized as a National Historic Civil Engineering Landmark by the American Society of Civil Engineers. Pennsylvania ...

Tunnel construction stands as a pivotal component in the development of modern infrastructure. With urbanization at its peak and space at a premium, the significance of efficient, safe, and ...

Sometimes close to a century or more must pass before we take notice of monuments in the neighborhood. When that magic chronographic moment arrives, surrounding streetscapes become cleared. Gates and ...

PITTSBURGH, Pa. — When the Liberty Tunnels opened on March 23, 1924, they marked the beginning of a transformation that would define the South Hills. Heralded as an engineering marvel, they had a ...

The National Transportation Safety Board sent Metro three urgent recommendations Wednesday regarding the ventilation of tunnels in response to the fatal smoke incident Jan. 12 in Washington, D.C. In a ...