National Geographic Fellow Maurizio Seracini, foreground, and his team viewing footage captured by the endoscope behind the Vasari wall at Palazzo Vecchio. (DAVE YODER/National Geographic - AFP/GETTY IMAGES)

Above: National Geographic Fellow Maurizio Seracini, foreground, and his team viewing footage captured by the endoscope behind the Vasari wall at Palazzo Vecchio. (DAVE YODER/National Geographic - AFP/GETTY IMAGES)

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