For Cooper, it was quite the opposite: a child's wonderland fueled by Indiana Jones-inspired adventures in the Grotto ... as the childhood home for Hugh Hefner's sons. Now 23, Hefner's youngest ...

While most people associate the Playboy Mansion with scantily clad playmates and sex-fueled debauchery, it served as the childhood home for Hugh Hefner's sons ... in the Grotto, a zoo full ...