In June of 1832, the 57 Irish migrant workers arrived at the docks of Philadelphia. Their job was to lance a flat path for the track through steep, hilly terrain. In railroad parlance, this is known as a 'cut' and thereafter that stretch of track would be known as Duffy's Cut. Six weeks later, they would all be dead.
A lot of eerie folklore and some community organized archaeology uncover a murder mystery on Philadelphia's Main Line.
Image courtesy the Duffy's Cut Project
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.