What on Earth?
S11 · E4 — Mystery of the Welsh Mine
S11:E4 · Mystery of the Welsh Mine
10 episodes in this season
Secret Soviet Spacecraft
42 min
Range of Nazi Evil
Doomsday Lair of Greece
Mystery of the Welsh Mine
Riddle of Sardinia Tower
Circles of the High Kings
Russia's Lightning Lab
Poland's Secret Nazi Compound
Holes of Dead Sea Destruction
Ancient Rome's El Dorado
