Guys, as far as I know, US Centurion cardholders do not have anything like this at all (access to special clubs).
Not to mention AMEX still hasn't felt obliged to establish a US CENT cardholders' web site, so except for the original welcome packet we received, which was out of date when I received mine, US CENT cardholders get NONE, as in Z E R O, updated info from AMEX regarding CENT perks on a continual basis.
Not bad for $2500 annual fee, eh ? (dripping with sarcasm)