PFH1173350: Vietnam: The French gunship 'Revolver' runs the gauntlet of the Chinese defences at Yo Oc, October 1884 / Bridgeman Images

PFH1173351: Vietnam: The Vietnamese prefect of Phu Doan, 1884 / Bridgeman Images

PFH1173354: Vietnam: French troops recover a Black Flag cannon after the Battle of Phu Hoai, 16 August 1883 / Bridgeman Images

PFH1173356: China: Early morning on Fenghuang's Tuo River, Fenghuang, Hunan Province / Bridgeman Images

PFH1173362: China: Boatman on the Tuo River, Fenghuang, Hunan Province / Bridgeman Images

PFH1173363: China: Boatman on the Tuo River, Fenghuang, Hunan Province / Bridgeman Images

PFH1173378: China: Rickshaws lined up on one of the old winding streets of Fenghuang, Hunan Province / Bridgeman Images

PFH1173390: China: North Gate Tower, Fenghuang, Hunan Province / Bridgeman Images

PFH1173393: China: Transporting a mule across the Lancang (Upper Mekong) c. 1895 / Bridgeman Images

PFH1173397: Burma / Myanmar / China: A convoy of military trucks on a section of the Burma Road, c.1945 / Bridgeman Images

PFH1173398: Burma / Myanmar / China: A convoy of military trucks on a section of the Burma Road, c.1945 / Bridgeman Images

PFH1173400: China: A mule train resting by the wayside in a small Hui Muslim village, Yunnan, 1903 / Bridgeman Images

PFH1173401: China: A simple restaurant by the Tea Horse Road in western Yunnan, c. 1900 / Bridgeman Images

PFH1173404: China: Jade Dragon Snow Mountain seen from Black Dragon Pool Park, Lijiang, Yunnan Province / Bridgeman Images

PFH1173415: China: Boy at a local alcohol shop near the North Gate Tower, Fenghuang, Hunan Province / Bridgeman Images

PFH1173418: China: Souvenirs for sale on the old city wall, Fenghuang, Hunan Province / Bridgeman Images

PFH1173419: China: Poster shop next to the Tuo River, Fenghuang, Hunan Province / Bridgeman Images

PFH1173426: China: Women selling flower tiaras, Fenghuang, Hunan Province / Bridgeman Images

PFH1173430: China: Outer wall tower next to the front gate, Jiayuguan Fort, Jiayuguan, Gansu / Bridgeman Images

PFH1173432: China: Wenchang Hall, Jiayuguan Fort, Jiayuguan, Gansu / Bridgeman Images

PFH1173435: China: Guanghua Men (Gate of Enlightenment), Jiayuguan Fort, Jiayuguan, Gansu / Bridgeman Images

PFH1173438: China: Western gate and tower at Jiayuguan Fort, Gansu Province / Bridgeman Images

PFH1173439: China: Jiayuguan Men (Gate of Sighs), Jiayuguan Fort, Jiayuguan, Gansu / Bridgeman Images

PFH1173440: China: Wenchang Hall and fort gate, Jiayuguan Fort, Jiayuguan, Gansu / Bridgeman Images

PFH1173452: China: A large prayer wheel, Labrang Monastery, Xiahe, Gansu province / Bridgeman Images

PFH1173454: China: A large prayer wheel, Labrang Monastery, Xiahe, Gansu province / Bridgeman Images

PFH1173465: China: Labrang Monastery, Xiahe, Gansu province / Bridgeman Images

PFH1173475: China: Demon painted on a doorway at Labrang Monastery, Xiahe, Gansu province / Bridgeman Images

PFH1173477: China: Gongtang (Gong Tang) Pagoda and prayer wheel gallery, Labrang Monastery, Xiahe, Gansu province / Bridgeman Images

PFH1173486: China: The Small Gold Tile Temple Hall, Labrang Monastery, Xiahe, Gansu province / Bridgeman Images

PFH1173488: China: Tibetan pilgrims pass the Grand Gold Tile Temple Hall, Labrang Monastery, Xiahe, Gansu province / Bridgeman Images

PFH1173489: China: The view from the Grand Gold Tile Temple Hall across Labrang Monastery, Xiahe, Gansu province / Bridgeman Images

PFH1173504: China: Chinese tourists on the singing sand dunes of Mingsha Shan (Mingsha Hills) in the Kumtagh Desert, Gansu Province / Bridgeman Images

PFH1173508: China: A visitor takes a sand sledge down the singing sand dunes of Mingsha Shan (Mingsha Hills) in the Kumtagh Desert, Gansu Province / Bridgeman Images

PFH1173511: China: A microlight over the singing sand dunes of Mingsha Shan (Mingsha Hills) in the Kumtagh Desert, Gansu Province / Bridgeman Images

PFH1173516: China: Camels rest at the singing sand dunes of Mingsha Shan (Mingsha Hills) in the Kumtagh Desert, Gansu Province / Bridgeman Images