Did you know there was a Halloween museum in the US? I didn't know until just now!
The Castle Halloween Museum is located in Boggs Run, West Virginia. It contains over 35,000 Halloween collectibles, decorations, ephemera, and artifacts. It's curated by the "Queen of Halloween" Pamela E. Apkarian-Russell, who obviously has a lifelong passion for Halloween.
Tours can only be taken by making an appointment in advance. But you can take an online tour of the antiques and collectibles, folk art, paintings and framed art, postcards, signs and advertising, and Tim Burton's "Nightmare Before Christmas" collectibles.
You can watch a video tour of the museum on YouTube; it runs over an hour and a half long.