Addams would enjoy the Presbyterian Cemetery on Mountain Avenue in Westfield as a child, where – according to author and Addams expert Ron MacCloskey – he would wonder what it was like to be dead.[5] In the cartoons, his ghoulish creations lived on Cemetery Ridge with a dreadful view.
A house on Elm Street and another on Dudley Avenue – into which police once caught him breaking and entering – are said to be the inspiration for the Addams Family mansion in his cartoons. College Hall, the oldest building on the current campus of the University of Pennsylvania, where Addams studied, was also an inspiration for the mansion.[6] One friend said of him: "His sense of humor was a little different from everybody else's." He was also artistically inclined, "drawing with a happy vengeance", according to a biographer.[3]
https://en.wikipedia.org/wiki/Charles_Addams
Original Morticia from her grave (his first wife):
https://www.findagrave.com/memorial/208438556/barbara-jean-hersey
Original model pack by Charles Addams: https://archive.org/details/adamsfamilymodelpack/page/n49/mode/2up
That's why I find it so funny when people want to complain/explain how authentic Wednesday is in the new series. They usually compare it to the first movie when there have already been numerous different interpretations to choose from.
BTW, the original TV series is available for free on YouTube.