Secrets of the Paris Métro

Vive the Grand Paris Express! (But Let's Not Forget the Original Métropolitain)

PARIS'S Métro system, that baby of the belle époque, will celebrate its 125th birthday in 2025. With its 50 miles of corridors, its 141 miles of tracks and its 308 stations -- including the cavernous Châtelet-les-Halles, considered the world's largest public transit station -- the Métro is a parallel, underground city, one that is as deeply embedded in …