Grotte du Diable, Cave entrance in Huelgoat, France.
The Grotte du Diable features narrow rock passages and towering granite formations carved by natural erosion processes over thousands of years.
Local folklore suggests this cave served as a hideout during the French Revolution when a fugitive lit a fire inside to escape pursuing royalist forces.
Known locally as Toull an Diaoul, this cave remains central to Breton mythology where legends speak of demonic figures dwelling in its depths.
Located at 23 rue du Pouly in Huelgoat with postal code 29690, visitors should wear sturdy footwear due to uneven terrain and rocky surfaces.
According to local legend, the cave contains 99 underground taverns where the Devil serves increasingly strong drinks to unsuspecting travelers who venture too deep.
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