From ancient subterranean cities to newly discovered urban sprawls hidden by the jungle, Earth is still keeping secrets. In Part 7 of our "Most Mysterious Places" series, we dive deep into the architectural marvels and eerie locations that defy easy explanation.

00:00 Intro

00:12 Upano Valley

03:09 Cerro El Cono

05:42 Longyou Caves

08:38 Derinkuyu

11:14 Sedlec Ossuary

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