Staff and students at Lakeview Elementary School always knew that history lurked in the building's basement. They just hadn't seen it for themselves. That "mystique" belongs to the bowling alley constructed inside the Mahopac, N.Y. school building's basement in 1937, when a group of locals scrounged up $50 each to fund the building of four lanes there. But for the past half-century, that history languished under the custodial debris of the storage closet that replaced it.