Why Didn't Voldemort Use the Fidelius Charm to HIDE His Horcruxes?

For someone to sacrifice their body and soul so many times, don't you think they would do just about ANYTHING to protect their newly made Horcruxes? Especially, since Voldemort made them in an effort to achieve immortality. Wouldn't he want to protect them so that he could live forever? Why in Merlin's beard wouldn't he have done absolutely EVERYTHING in his power to keep them safe, to hide them? Like - oh, I don't know - use a secret-keeping spell like the FIDELIUS CHARM?!

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