Belgian soldiers repelling a fierce German attack at Liege during World War One. From The History of the Great War, published c. 1919

La Revanche- The French advance to Altkirch, Alsace, France during World War One. From The History of the Great War, published c. 1919

The German cavalry, the Uhlans, come up against barbed wire erected by the Belgians to stop their advance during World War One. From The History of the Great War, published c. 1919

Field Marshal Douglas Haig, 1st Earl Haig, 1861 – 1928. British senior officer during World War I. From The History of the Great War, published c. 1919

Businessman holds the world in his hand

carved wooden doors; cordoba, argentina

Jasper National Park, Jasper, Alberta, Canada; Bull Elk (Cervus Canadensis)during rut season

Christopher Columbus, c. 1450/1451 -1506. Genoese explorer, navigator and colonizer. From La Ilustracion Española y Americana, published 1892.

Albert Theodor Otto Emmich, from 1913 von Emmich, 1848 – 1915. Prussian general. From The History of the Great War, published c. 1919

Roman bridge of Cordoba; Cordoba, Andalusia, Spain

Antique World Map (copper engraving)., c. 1700

Antique World Map (copper engraving)., c. 1680-1700

Antique Map Detail with Compass (hand-colored copper engraving)

Antique World Map (copper engraving)., c. 1697

Illustration of a rocky and variegated extrasolar planet, Gliese 581 c.

Fashion & Costume - (Color) c. 1590 England The Elizabethan age (1558-1603), the reign of Queen Elizabeth I of England, saw the beginnings of English world power. In this period Scottish mathematician James Napier first conceives the concept of logarit

Architecture - Ancient Greece - line art Perspective Illustration The Mausoleum of Halicarnassus, the tomb of King Mausolus of Caria in southwestern Asia Minor, c. 350 BC. This building was one of the Seven Wonders of The World. It was destroyed in an ea

An artist's depiction of the close pass of comet C/2013 A1 over Mars.

An artist's depiction of the close pass of comet C/2013 A1 over Mars.

Artist's depiction of the comet C/2013 A1 making a close pass by Mars.

Architecture - Ancient Greece - line art Detail Classical Sculptured Ionic column from the Temple of Diana at Ephesus, c. 650 BC, also known as the Temple of Artemis and in ancient history was one of the Seven Wonders of The World. The ruins of this temp

Illustration comparing the size of extrasolar planet Gliese 581 c with that of the Earth.

The world in a c-clamp