The Grotto at Posillipo; Thomas Jones; 1742-1803; British; active in Italy (1776-83); ca. 1782; Watercolor; graphite; pen and gray ink; and gouache on moderately thick; moderately textured; cream laid paper; Sheet: 11 1/2 x 16 5/8 inches (29.2 x 42.2 cm); Image: 9 3/4 x 15 7/8 inches (24.8 x 40.3 cm); and Image: 9 1/2 x 15 9/16 inches (24.1 x 39.5 cm); architectural subject; cave; clouds; cobblestones; door; figures; gates; Grand Tour; grotto; height; landscape; rocks (landforms); shadows; stone; trees; tunnel; Europe; Grotto of Sejanus; Italy; Naples; Pos韑lipo