Archaeologists exploring a karst cave system in the French Pyrenees have identified a prehistoric "light theater." The site features strategically placed stone mirrors and carved apertures that allowed sunlight to illuminate specific interior altars only during the Bronze Age summer solstice.
Charcoal remains and bone fragments found near the cave entrance suggest that these light-driven festivals involved multi-day feasting and the display of polished metal objects. The discovery reveals a sophisticated understanding of solar mechanics used to stage awe-inspiring ceremonial events in ancient Europe.