NAM5926779: Rifleman of the 4th Gurkha Regiment in marching order, 1890 (w/c), Lovett, Alfred Crowdy (1862-1919) / Bridgeman Images

HRP5246074: Queen Victoria and Louis-Philippe at Windsor Castle, 1844 / Bridgeman Images

HRP5246064: The First Council of Queen Victoria, 1837 / Bridgeman Images

LLM5207663: The two boys (litho), English School, (19th century) / Bridgeman Images

LIP1043577: The Mekran Expedition (litho), Soper, George (1870-1942) / Bridgeman Images

XLE3759451: The Beggar 's Opera by John Gay, Hogarth, William (1697-1764) / Bridgeman Images

XLE3759441: Bold Stroke for a Wife - illustrated ticket by William Hogarth, Hogarth, William (1697-1764) / Bridgeman Images

LIP1050660: Regina's Maids of Honour (engraving), Maclise, Daniel (1806-70) (after) / Bridgeman Images

LLJ585276: The Royal Society (engraving), English School, (19th century) / Bridgeman Images

HRP5246082: The Marriage of the Prince and Princess of Wales, 1863 / Bridgeman Images

XLE3747445: Set design for Moliere 's Georges Dandin, Zelenka, Frantisek (1904-43) / Bridgeman Images

LLM726907: Mr Gladstone, past and present (engraving), Walker, Samuel A. (fl.1865) (after) / Bridgeman Images

LLP728991: Our colonial wool trade (engraving), English School, (19th century) / Bridgeman Images

KAI7206033: FRANYO AATOTH, 2008 (Photography), Aatoth, Franyo (b.1954) / Bridgeman Images

UTD4951739: Daylight at Last!' Henry Morton Stanley (1840-1904)Welsh-born American journalist and explorer, 1889 (illustration) / Bridgeman Images

LCP463236: Pennsylvania State Agricultural Society certificate, printed by Herline & Co., c.1871 (tinted & hand-coloured litho) , Rosenthal, Max (1833-1918) / Bridgeman Images

LLM960857: The Ballad of Dame Durden (colour litho), English School, (19th century) / Bridgeman Images

XOS3928819: Cannon Rock, 1895 (oil on canvas), Homer, Winslow (1836-1910) / Bridgeman Images

XLE3759457: Ticket for The Old Bachelor illustrated by William Hogarth, Hogarth, William (1697-1764) / Bridgeman Images

LLP728989: Professors Ayrton and Perry's new electric railway (engraving), English School, (19th century) / Bridgeman Images

PIX4616544: Glaciers under Martian crateres - Buried glaciers on Mars - Computer reconstructed views of three Martian crateres in the Hellas region that house glaciers. The images show the crateres as they appear today with a layer of Martian soil covering the ice with water and, on the right, the glaciers updated according to radar measurements obtained by the Mars Reconnaissance Orbiter probe (MRO). These glaciers would have a thickness of 250 to 450 meters. Each image covers 20 km wide. This computer graphic image shows three craters in the eastern Hellas region of Mars containing concealed glaciers detected by radar. The images shows how the surface looks today with the ice covered with a layer of Martian soil and what the ice may look like underneath. The image was created using image data from the Context Camera on the Mars Reconnaissance Orbiter (MRO) spacecraft combined with results from the SHARAD radar sounder on MRO and HRSC digital elevation map from the Mars Express spacecraft. The color of the Martian surface and ice was estimated from MRO HiRise color images of other Martian craters and the polar ice caps. The buried ice in these craters as measured by SHARAD is ~ 250 meter thick on the upper crater and ~ 300 and 450 meters on the middle and lower levels respectively. Each image is 20 km (12.8 mi.) across and extends to 50 km (32 mi) in the distance. Recent measurements from the Mars Reconnaissance Orbiter SHARAD radar sounder have detected large amounts of water ice in such deposits over widespread areas, arguing for the flow of glacial - like structures on Mars in the relatively recent geologic past. This suggests that snow and ice accumulated on higher topography, flowed downhill and is now protected from sublimation by a layer of rock debris and dust. Furrows and ridges on the surface were caused by deforming ice / Bridgeman Images

XLE3759443: Ticket for The Old Bachelor illustrated by William Hogarth, Hogarth, William (1697-1764) / Bridgeman Images

LLP728586: The field of Waterloo (engraving), English School, (19th century) / Bridgeman Images

HRP5246099: The marriage of Prince George and Princess Mary of Teck, 1893 / Bridgeman Images

LIP1038105: The Prince of Wales unveiling the Statue of Sir Bartle Frere on the Thames Embankment (engraving), English School, (19th century) / Bridgeman Images

KDC498770: Dadabhai Naoroji, The Grand Old Man of India, 1914 (b/w photo), Bourne & Shepherd (19th-20th century) / Bridgeman Images

XLF3783080: John Tenniel 's letter to Lewis Carroll / Bridgeman Images

LLE819933: Birthplace and residences of Thomas Carlyle (engraving), English School, (19th century) / Bridgeman Images

LCP463679: J. Willis, shoe manufactory, 241 Arch Street, Philadelphia, December 1846 (litho) , American School, (19th century) / Bridgeman Images

HRP5246068: The Christening of Victoria, Princess Royal, 10 February 1841, Leslie, Charles Robert (1794-1859) / Bridgeman Images

LIS2616969: Home from the West'ard, 1890 (oil grisaille on board), Brangwyn, Frank (1867-1956) / Bridgeman Images

PFH2642420: Russia / Soviet Union: 'The New bourgeoisie in the Republic of Labour', Vladimir Lebedev (1891-1967), c. 1920, Lebedev, Vladimir Vasilevic (1891-1967) / Bridgeman Images

PFH2642411: Russia / Soviet Union: 'The Struggle Against Sales in the Streets', Vladimir Lebedev (1891-1967), c. 1920, Lebedev, Vladimir Vasilevic (1891-1967) / Bridgeman Images

LIP1061513: The French in Tonkin, the Recent Battle at Sontay, 1883 (engraving), English School, (19th century) / Bridgeman Images