According to some, underneath our feet is a second, inverted world, home to strange beasts, the Lost Tribes of Israel . . . maybe even Hitler. In the nineteenth century, a booster for this “hollow earth” theory was one John Cleves Symmes of Sussex County, New Jersey. Accompanied by a perforated wooden globe, between 1818 and 1827 Symmes crisscrossed the United States delivering lectures on the existence of portals to this “underworld” located at the poles, and urging an expedition be undertaken to discover them. Drexel University’s Robert McCracken Peck comes on the pod to talk about the theory and the globe in this episode of Curious Objects.

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