Tunnels may not be glamorous, but there are few things more satisfying than honking your car’s horn when driving in a tunnel bored through a mountain. The urge to test the acoustics of a car horn in a ...

An engineering marvel made possible by the backbreaking and dangerous work performed by Chinese railroad workers has been designated a national historic civil engineering landmark. The Chinese ...

Across two very different continents, scientists are mapping vast systems of ancient tunnels that were not carved by rivers ...

The impetus -- Vexing questions -- A coal famine -- The wedding ring -- A controversy acute and personal -- Political and petty tampering -- Another long and costly delay -- A tempest in a teapot -- ...