Painted in 1894 for the California Midwinter International Exposition in San Francisco, Apollo and Zeus Meeting in the Heavens is a monumental surviving relic of America’s lost Gilded Age. Created by Ernest Étienne Narjot for the Fine Arts Building—later the original home of what is now the de Young Museum in San Francisco's Golden Gate Park—this vast 15½-by-10-foot canvas was conceived as a ceili…