The Superman Museum (37.152684, -88.732646), or technically the Super Museum, in Metropolis, Illinois, is both a museum dedicated to Clark Kent/Superman and a comic book store/souvenir shop.
Outside the brightly-colored (red, blue & yellow of course) brick building you’ll find a phone booth (just in case Clark needs to change), a green car reminiscent of the car on the cover of Action Comics #1 (the debut of Superman) and some contraptions that let you take a photo of your head on Superman or Supergirl’s body.
Inside you’ll find a museum, and a comic book store skewed towards Superman and DC Comics. The best purchasable items are the glow-in-the-dark Kryptonite rocks and the Kryptonite candy.
This Super Museum is worth a visit if you’re in the area, and I suppose it would be a must-visit destination for super-fans of Superman.