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This Beaver Secretion Was Thought to Cure Ailments

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This Beaver Secretion Was Thought to Cure Ailments

Short | 02:14

Beavers secrete a substance known as castoreum, which they use to keep their fur waterproof. This made them a target for medieval doctors who used it as a remedy for ulcers, fevers and even rheumatism.

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Standing deep in the German countryside for over 500 years, Heidelberg Castle was once home to the country's first university. Now, it has become part of the surrounding ecosystem. From toads swimming in the grounds' fountains to peregrine falcons nesting in the bell tower, tour a medieval mausoleum steeped in nature.

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