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Sci Ch - What on Earth Series 10 (2021) Part 4 Hidden Fortress of Secrets (2021)

What on Earth Series 10 Part 4 Hidden Fortress of Secrets (2021)

Satellite images capture a strange castle-like structure hidden in Scotland's dense and remote woodlands; expert archaeologists investigate and uncover an area with a bloody history linked to the birthplace of the world's oldest secret society.

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