150 years ago travelling with a camera was both a novelty and an enormous challenge. The intrepid photographers who took their cameras to remote parts of the world brought back images which amazed their peers. Photographer and historian John Hannavy has recreated some of their epic journeys: exploring the Nile from Cairo to Abu Simbel along the route Francis Frith followed between 1856 and 1859; exploring China and Cyprus as John Thomson did between 1863 and 1878.