What on Earth?
Season 11 Episode 4 - Mystery of the Welsh Mine
6.4 ?
2015
Documentary
Satellites capture ruins amid bizarre structures on a Welsh mountaintop.
Episodes in Season 11
1
Secret Soviet Spacecraft
42 min
2
Range of Nazi Evil
42 min
3
Doomsday Lair of Greece
42 min
4
Mystery of the Welsh Mine
42 min
NOW PLAYING
5
Riddle of Sardinia Tower
42 min
6
Circles of the High Kings
42 min
7
Russia's Lightning Lab
42 min
8
Poland's Secret Nazi Compound
42 min
9
Holes of Dead Sea Destruction
42 min
10
Ancient Rome's El Dorado
42 min
