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Season guide
History's Mysteries: Season 4
16 episodes
Updated Sep 29, 2026
Previously on History's Mysteries
Season 4 Lore Primer
Key plot threads, lore context, and character stakes you need to remember before diving into this season.
- Directly follows the overarching narrative developments of History's Mysteries Season 3.
- Faction dynamics and core character alliances shift under escalating external stakes.
- Crucial mysteries introduced previously reach key turning points and narrative reckonings.
- Sets up serialized story arcs that build directly toward the climactic season finale.
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Season 4 Episodes
Episode Guide
🛡️ SPOILER SHIELD
Season 4 Progress Shield
Future titles & synopses blurred. Tap "Reveal" on any card to peek.
S4·E5
Core
Salem Witch Trials
Nov 10, 2011 · 60 min
Exploring the Salem Witch Trials, which took place in 17th-century Massachusetts. The hour looks at recorded accounts of accusation, imprisonment, trial and execution.
S4·E6
Core
The True Story of the Philadelphia Experiment
· 60 min
The rumors have persisted for over fifty years. They have all the trappings of fiction, yet there are those who persist on believing that the U.S. Navy actually rendered a warship