Editor’s note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter . Get news about destinations, plus the latest in aviation, food and drink, and where to stay. CNN  —  In our roundup of travel stories this week: the spectacular legacy of Alexander the Great, where trainspotters go to see bullet trains “kiss,” plus British attempts to crack down on antisocial noise. Noise pollution First there was “ rawdogging .” Then there was “ barebacking .” Now there’s another travel trend with