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I think it unlikely that mere curiosity made him enter Moria. After Elrond declares that he "shall be betrothed to no man's child as yet", Aragorn takes leave of him and "for nearly thirty years he laboured in the cause against Sauron", undertaking many perilous journeys, some with Gandalf but as time went on more often by himself [Appendix A (v) ].
After Elrond puts forward his requirement that Arwen "should not be the bride of any Man less that the King of both Gondor and Anor" Aragorn "went forth again to danger and toil". (Appendix A (v) )
Short point - I don't see Aragorn given his 'man on a mission' schedule having the time to walk through Moria simply to find out what's there. Two possible reasons he may have passed through Moria:
1. He, like the Fellowship, was forced to take that route, possibly to avoid pursuit of some kind. In pitching the idea of the Moria route to the Fellowship Gandalf notes that taking it would allow them to "vanish from sight for a while, and cover our trail". (FotR-A Journey in the Dark)
2. He, Aragorn, was in pursuit of someone/something and the trail led him through Moria.
As to what he (1)wished to avoid or (2) might have been pursuing Aragorn never says (well at least not in LotR, I don't know if the matter is addressed elsewhere).
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