American Express offers a series of airport lounges in the US, as well as a few outside of the US, which are complimentary for certain cardholders, including American Express Platinum cardholders. Since I have the American Express Platinum, I enjoy free access to these lounges. I first experienced a Centurion Lounge in Buenos Aries Ezeiza Airport (EZE), and have been a bit obsessed ever since. The Centurion Lounges in the US are rumored to be much nicer than the international lounges, but I, unfortunately, have not visited enough of these lounges to make a firm decision.
A new Centurion Lounge!