When Central Street and Bullard Street were first built, they went through pastures that were used for raising livestock. Three stone-faced tunnels were built under these roads to allow the animals to move from pasture to pasture. A pig tunnel ran under Central Street, just west of its intersection with Bullard Lane. Two cow tunnels were also built, one under Central Street and the other under Bullard Street. The two tunnels under Central Street were later filled in by the city of Holliston. They feared that heavy traffic would cause the tunnels to collapse. The tunnel under Bullard Street is still open and passable. This remaining cow tunnel is listed on the National Register of Historic Places.