VILA NOVA DE FOZ COA, PORTUGAL - JUNE 9, 2016: The guide shows paintings on the rock in the Prehistoric Rock-Art Site of the Coa Valley. The site is one of UNESCO World Heritage Sites.
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VILA NOVA DE FOZ COA, PORTUGAL - JUNE 9, 2016: The guide shows paintings on the rock in the Prehistoric Rock-Art Site of the Coa Valley. The site is one of UNESCO World Heritage Sites.