Juan Laurent, ‘Bridge and tunnel over Jalon, Madrid to Zaragoza’, ca. 1860-65, National Gallery of Art, Washington, D.C.
image: 33.9 x 25.1 cm (13 3/8 x 9 7/8 in.)  mount: 52.8 x 40.9 cm (20 13/16 x 16 1/8 in.)