I was in Torino last year and went to the church where it is stored. Although you can only see pictures and copies and other memorabilia now, they have done a great job in the presentation, including a computer model of what the person in the shroud looked like.
Needless to say, I was quite moved and thought it was authentic despite the evidence from the Carbon dating test (which may now be questionsable).
I would encourage you to go and see for yourself....
I really have never heard any miracles being asociated with the shroud. The Crusaders brought back alot of weird things from the East ie: the foreskin of John the Baptist Breast milk from the Virgin Mary. People were so innocent then that they believed it.