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A detail of a chart showing lines of magnetic compass variation made in 1702 by the English scientist and cartographer Edmond Halley (1656-1742). Halley hoped the chart would aid navigation but the variations in magnetism over time made it...

West Point and the Highlands, colour engraving by Samuel Valentine Hunt, 1869. Depicted here is a view from the heights of the west bank of the Hudson River, looking northward along the valley. The United States Military Academy, also commonly...

Valcamonica, situated in the Lombardy plain of Italy, has one of the world's greatest collections of prehistoric petroglyphs — more than 140,000 symbols and figures carved in the rock over a period of 8,000 years and depicting themes connected...