As trick-or-treaters put the final touches on their costumes and decorators put the tops back on their carved pumpkins, ...

The store’s inventory includes taxidermy ravens, a mummified baby iguana, and serial killer memorabilia, such as a Michael Myers figure.

At oddity shops, customers may pick up anything from a bleached skull to a preserved puppy suspended in fluid to a painting featuring iridescent, pinned beetles. The growing fascination with the ...