There's a nifty bit of hidden history tucked away in Philadelphia's Wissahickon Valley Park -- a cave that, legend has it, was home to a doomsday cult. In today's episode, the guys follow the strange journey of Johannes Kelpius and his followers from Europe to North America as they prepared for the end of days (first in 1694, then in 1700). Tune in to learn what motivated the group, how they influenced American history, and what happened to them after the world kept spinning in today's Classic episode.

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