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I love the old laws that are now completely bonkers because the circumstances that called for them no longer exist.
In some places it is illegal to lie under a public walkway. They made those laws in the days of wooden sidewalks, where you could lie underneath and peek through gaps in the boards to look up ladies skirts.
Why are laws from pre-statehood even valid to begin with? >

Probably a clause allowing laws prior to continue >

Perhaps the question is why haven’t they be revisited? >

Other stuff to worry about than old laws that no one enforced. Like how in PA it's illegal to sing in the bathtub