Hoosac Tunnel

Digging the Hoosac Tunnel through the mountain of the same name in western Massachusetts took from 1851 to 1875 — nearly a quarter century to bore just under five miles of rock, using some of the earliest large-scale applications of nitroglycerin and compressed-air drilling in the country. It was, for its time, one of the most ambitious engineering projects in America.

The cost was measured in lives as much as money. Roughly 200 workers died during construction, from explosions, cave-ins, and accidents with the era's still-experimental blasting techniques — including a notorious 1867 incident in which a premature detonation killed thirteen men trapped in the central shaft. That toll earned the tunnel its lasting nickname: the Bloody Pit.

Still an active rail line today, the tunnel has drawn generations of reports from workers and visitors alike — disembodied voices, unexplained lights deep in the passage, and figures glimpsed near the portals that vanish before anyone can get close. Locally, the stories are treated less as ghost tales than as an acknowledgment of what it actually cost to build the thing.