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Season 4
Where To Watch Secrets Season 4
Smithsonian Channel
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1
Tower of Babel
April 24, 2017 · 9.0
2
Riddle of Petra
May 1, 2017 · 9.0
3
Stonehenge Mystery
May 8, 2017 · 9.0
4
Headless Gladiators of York
May 15, 2017 · 9.0
5
Plagues of Egypt
May 22, 2017 · 9.0
6
Shrunken Heads
May 29, 2017 · 9.0
7
Bog Bodies
June 5, 2017 · 9.0
8
Garden of Eden
June 12, 2017 · 9.0