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Hollow Earth: The Long and Curious History of Imagining Strange Lands, Fantastical Creatures, Advanced Civilizations, and Marvelous Machines Below the Earth's Surface
Beliefs in mysterious underworlds are as old as humanity. But the idea that the earth has a hollow interior was first proposed as a scientific theory in 1691 by Sir Edmond Halley (of comet fame), whoExpand
The art of money : the history and design of paper currency from around the world
"L'argent. Dinero. Geld. Dough." Whatever you call it, money makes the world go round. The United States is dispensing its first redesigned bills in decades, and the Euro is on the brink of unifyingExpand
The Art of Money