Satellite images capture monumental ruins surrounded by bizarre feather-shaped structures on a Welsh mountaintop; experts investigate a hidden tunnel containing the remains of an abandoned slate mine with an exploitative and deadly past.
What on Earth? - 11x04 Mystery of the Welsh Mine
- Poor
- Nothing special
- Worth watching
- Pretty cool
- Awesome
- Aired Jul 13, 2022
- Episode 11x04
- Show special No
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- goldalchemist is following What on Earth?. Mar 01, 2018
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goldalchemist last seen Aug 10, 2022
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