The Seattle Times

ROBERT ORMEROD / NYT
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Tuesday, April 22, 2014

Biking an ancient Celtic route in France

Graham Robb, the author and historian, at his home in Penton, Scotland. Robb's theory that the Celts had mapped Western Europe with accurate lines thousands of years ago based on their astronomical measurements has its detractors, but the posited Celtic route through Spain, Andorra and the South of France is a remarkably scenic trip even today.