Traveling through space is geography.  Traveling through time is history.  I just finished reading the Travels of Marco Polo and Great Railway Bazaar by Paul Theroux simultaneously; okay, actually I was alternating between them.  As fate would have it, they’re traveling somewhat the same route, at least part of the way.  No I didn’t plan it that way.  If I had, then it wouldn’t be serendipity.  I like that word, and I like the meaning behind it—the happy accident, the brilliant mistake.  It’s not a race, because I already know who’d win.  Slow as they are, trains are fast compared to caravan travel on the Silk Road, or even the open seas, which was the only option in Marco Polo’s time.  But as long as every picture tells a story, then overland travel is eminently worthwhile.  Once they’re known and renowned, then even the most impressive trail among them can become boring....

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