Okay, this is weird, but I collect memorabilia related to the original gothic rock band Bauhaus. My favorite...
Autographed rarities, posters, interviews, early versions of the "Bela Lugosi" single, imports, interview discs, shirts, etc. I have some really nice stuff, but since nobody in Oklahoma knows who Bauhaus was, nobody here cares.
I also collect art, books, and music from the Chippewa (aka, Ojibway) and Lakota Indian tribes, inasmuch as this is my own family heritage (I lived at Cheyenne River Reservation abnd speak conversational Sioux).