For today's Geoquiz we're looking for a walled city in the Marche region in Italy, deemed a World Heritage Site for its remarkable legacy of Renaissance culture. The answer is Urbino, Italy. The city is SUPPOSEDLY the setting for a painting that's part of an exhibition at Britain's National Gallery, but THAT'S come into question. The exhibition is called �Fakes, Mistakes and Discoveries.� The World's Alex Collins tells us how scientists have helped art historians discover more of the story behind works of art.

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