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In this episode of The Atlas Obscura Podcast, we visit a treacherous path cut through a stretch of the Pyrenees Mountains in France that may have played a key part in one nation’s quest for international influence—and possibly helped foment a revolution.

Our podcast is an audio guide to the world’s wondrous, awe-inspiring, strange places. In under 15 minutes, we’ll take you to an incredible site, and along the way you’ll meet some fascinating people and hear their stories. Join us daily, Monday through Thursday, to explore a new wonder with cofounder Dylan Thuras and a neighborhood of Atlas Obscura reporters.

Philoursmars, Atlas Obscura User