Images

Beautiful Prairie Bluffs, Upper Mississippi, oil on canvas by George Catlin, 1835-1836. Smithsonian American Art Museum, Washington, DC.

Butte de Mort, Sioux Burial Ground, Upper Missouri, oil on canvas by George Catlin, 1837-1839. Smithsonian American Art Museum, Washington, DC.

Sioux Worshiping at the Red Boulders, oil on canvas by George Catlin, 1837-1839. Smithsonian American Art Museum, Washington, DC.

A map illustrating the route and failing fortunes of the Spanish Armada (from Spanish - Grande y Felicísima Armada, “Great and Most Fortunate Fleet”) in 1588. A crucial part of a planned invasion of England by King Philip II of Spain, the...

A microscope of the type invented by the English scientist Robert Hooke (1635-1703). Made between 1671 and 1700. The device on the left, designed by Hooke, is a scotoscope which helped better illuminate the specimen under view in the microscope...

A posthumous portrait of the celebrated scientist Robert Hooke (1635-1703), a key figure in the Scientific Revolution. Painted by Rita Greer in 2009. (Department of Engineering Science, Oxford University)

Various types of corn (maize). Photo by Keith Weller. Agricultural Research Service, U.S. Department of Agriculture.

Lahore Fort, Pakistan, called Shahi Qila (meaning "Royal Fort") in Urdu, was originally built in the 11th century, then destroyed and rebuilt several times. The site was inscribed as a UNESCO World Heritage Site in 1981.

A board showing the tools commonly used by stone masons in the Middle Ages in Europe. On display at Guédelon castle in Treigny, Burgundy, France.

A board showing the carpentry tools commonly used in the Middle Ages in Europe. On display at Guédelon castle in Treigny, Burgundy, France.