Côa Valley and Siega Verde, a UNESCO World Heritage site in Portugal and Spain, recognized in 1998 and extended in 2010, are open-air rock art sites featuring thousands of Paleolithic engravings from 22,000 to 10,000 BCE. Etched into schist along river valleys, these carvings of horses, aurochs, and hunters reflect humanity’s earliest artistic expressions. This transnational site showcases Iberia’s prehistoric heritage, preserving a rare outdoor gallery of ancient life across borders.

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