Yep both by Michalangelo and two of the greatest ever. The idiot who attacked the Pieta with a hammer no less was a crazed Aussie Hungarian which I also happen to be. Never had an inkling to ever do any vandalism in my life though.
Apparently Michelangelo said something to the effect that sculpting a statue wasn't that difficult--you just had to remove the stone that shouldn't be there. At least that's how I remember something from an Art Appreciation class many years ago.