"Doughty introduced classical ruins into his landscapes as early as 1829, eight years before his first trip abroad in 1837. It was only during his second trip abroad in 1845-47 that he visited the continent, and no evidence exists that he ever travelled to Germany. What he used for his sources in copying classical ruins is now pure speculation." (F.H. Goodyear, Thomas Doughty, 1793-1856: An American Pioneer in Landscape Painting, Philadelphia, Pennsylvania, 1973, p. 26)
This painting was executed circa 1830.