The classic children's show Captain Kangaroo aired on TV for nearly 30 years, starting in 1955. After its creator and star, Bob Keeshan, died in 2004, his estate donated a few of his beloved hand puppets to the Smithsonian.
Sometimes you need some distance to appreciate a classic.
That was certainly the case for John Williams' novel Stoner. When it was originally published in 1965, the only publication to mention the book at all was The New Yorker, in its "Briefly Noted" column. The novel received admiring reviews over the years, but sold just 2,000 copies and was almost immediately forgotten.