HistoryMind-BlowingJean-Pierre Osenat was doing a routine appraisal of a Paris townhouse when he noticed a painting on the wall. It turned out to be a Rubens masterpiece - a 1613 work called Christ on the Cross that had vanished for over 400 years, known to the art world only through engravings. Authenticated by microscopic paint analysis, it sold for $2.7 million.1 hour ago