The approach to Petra, looking up to an ancient watchtower

DAVID ROBERTS, R.A. (EDINBURGH 1796-1864 LONDON) The approach to Petra, looking up to an ancient watchtower inscribed and dated 'Approach to PETRA. An Ancient watchtower commanding the valley of El. Ghor. Feby 5th 1839' (lower center) graphite and watercolor, heightened with bodycolor, on buff paper 9 3⁄8 x 13 ¼ in. (23.7 x 33.6 cm)