Memphis, Central Texas, St Louis. These are pilgrimage sites for the BBQ faithful. And while Pittsburgh doesn't rank on that scale yet, if the meat coma I got from the ribs at Pittsburgh Barbecue Company is any indication then they are definitely on their way.
And even though the ribs are flavorful and juicy enough, thanks to an incredible rub, that they don't even need sauce on them you should still get the sauce because its vinegary/peppery taste has enough spice to enhance the meat, but not overpower it.