For decades, archaeologists suspected that a strange landscape hidden in the Spanish Pyrenees was more than a product of nature. Deep trenches, artificial ravines and enormous excavated areas hinted at a forgotten human story buried beneath the mountains.

An ancient mountain cave in the Pyrenees may have served as one of the earliest high-altitude mining camps ever discovered, with evidence of repeated visits spanning thousands of…

For decades, archaeologists suspected that a strange landscape hidden in the Spanish Pyrenees was more than a product of nature. Deep trenches, artificial ravines and enormous…