Greenfield v. Watson

“If upon the premises of an owner situated in dangerous proximity to a public thoroughfare there be an excavation into which persons passing along the thoroughfare, in the exercise of ordinary care, might casually fall, it is the duty of the owner of the premises so to inclose the same as to afford reasonable immunity against the danger which might otherwise probably result from its existence. Whatever may be the duty of an owner of premises with reference to persons who unlawfully intrude thereon, such owner has no right to maintain upon his premises any dangerous nuisance which might…