My kids discovered a box yesterday on which my wife had written, "Alan's games." So they wasted no time in thoroughly investigating it.
They found my two Tarot decks (Witch's and Rider-Waite). I still don't have the Lovecraft Tarot. Someday. No, I don't do fortune-telling. I just think they're cool.
The old (non-electronic) Battleship game.
A couple of fantasy-based board games that I don't remember buying but obviously did, and which I've never played.
But most importantly: Gamma World and The World of Greyhawk! I always loved to pore over those big Greyhawk maps. I thought they were so cool, and still do.