Alexander von Humboldt was the reigning scientific mind of the early nineteenth century, a unique combination of naturalist and adventurer. With his companion Aimé Bonpland, Humboldt cut a six-thousand-mile swath across the New World, through what is now Venezuela, Colombia, Ecuador, Peru, Mexico, and Cuba. Risking his life in treacherous terrain, he conducted the first extensive scientific study of the Andes and the Amazon, literally redrawing the map of the Americas and dramatically expanding our knowledge of the natural world. He brought back to Europe more than 60,000 plant specimens and a multitude of exotic New World animals, set an altitude record while climbing the volcano Chimborazo, made revolutionary discoveries regarding volcanoes and the Earth's magnetic field, and introduced millions of Americans and Europeans to the astonishing cultures of the Aztecs and the Incas.

At the completion of his epic journey, Humboldt became one of the most celebrated men in the world, feted by Thomas Jefferson in Washington and invited to Napoleon's coronation in Paris. His ideas revolutionized scientific research; laid the groundwork for entire new fields of study, such as climatology, oceanography, and several branches of geography; and his adventures and insights profoundly illustrated followers such as Charles Darwin and Louis Agassiz. Today, more places and geographical features are named after Humboldt than any other historical figure, and scientists continue to build on the foundations he established.

A tale of rousing adventure and groundbreaking science, Humboldt's Cosmos is a fascinating portrait of a brilliant mind and a bold spirit whose momentous journey of exploration greatly expanded the scope of his world—and ours.