The Spartan culture perished.
> One woman, observing her son coming towards her, inquired, "How fares our country?" And when he said, "All have perished," she took up a tile and, hurling it at him, killed him, saying, "And so they sent you to bear the bad news to us!"
I'm thinking Jewish culture (though it's not monolithic), that's about the only one I can think of whose customs, traditions, etc. still remain today.