Season Four of History's Greatest Mysteries premiered on January 30, 2023.
Episodes
| # |
#
|
Title
|
|
|
Airdate
|
|
|
|
| 24 |
1
|
The Loch Ness Monster
|
|
|
January 30, 2023
|
|
|
|
| 25 |
2
|
Who is the Zodiac Killer?
|
|
|
February 6, 2023
|
|
|
|
| 26 |
3
|
The Assassination of JFK
|
|
|
February 13, 2023
|
|
|
|
| 27 |
4
|
The Lost Colony of Roanoke
|
|
|
February 20, 2023
|
|
|
|
| 28 |
5
|
The Phoenix Lights Phenomenon
|
|
|
February 27, 2023
|
|
|
|
| 29 |
6
|
The Ark of the Covenant
|
|
|
March 6, 2023
|
|
|
|
| 30 |
7
|
The "Missingest" Man in America
|
|
|
March 13, 2023
|
|
|
|
| 31 |
8
|
Blackbeard's Lost Treasure
|
|
|
March 20, 2023
|
|
|
|
| 32 |
9
|
Decoding the Mysterious Antikythera Mechanism
|
|
|
March 27, 2023
|
|
|
|
| 33 |
10
|
The Puzzling Pyramids of Egypt
|
|
|
April 17, 2023
|
|
|
|
| 34 |
11
|
The Hunt for Stolen Nazi Treasure
|
|
|
April 24, 2023
|
|
|
|
| 35 |
12
|
The Deadly Bermuda Triangle
|
|
|
May 1, 2023
|
|
|
|
| 36 |
13
|
The Search for Noah's Ark
|
|
|
May 8, 2023
|
|
|
|
| 37 |
14
|
Who Is D.B. Cooper?
|
|
|
May 15, 2023
|
|
|
|
| 38 |
15
|
The Legend of Bigfoot
|
|
|
May 22, 2023
|
|
|
|
| 39 |
16
|
Unlocking the Secrets of Stonehenge
|
|
|
May 29, 2023
|
|
|
|
| 40 |
17
|
The Search for El Dorado
|
|
|
June 5, 2023
|
|
|
|
| 41 |
18
|
The Mysterious Havana Syndrome
|
|
|
June 12, 2023
|
|
|
|
| 42 |
19
|
Unlocking the Secrets of the Nazca Lines
|
|
|
June 26, 2023
|
|
|
|
| 43 |
20
|
The Hunt for Cleopatra's Missing Tomb
|
|
|
July 10, 2023
|
|
|
|
| 44 |
21
|
TWA Flight 800
|
|
|
July 17, 2023
|
|
|
|
| 45 |
22
|
The Hunt for Hitler
|
|
|
July 24, 2023
|
|
|
|
| 46 |
23
|
The Lost Gold of WWII
|
|
|
July 31, 2023
|
|
|
|
| 47 |
24
|
The Black Dahlia
|
|
|
August 7, 2023
|
|
|
|
| 48 |
25
|
Gardner Museum Robbery
|
|
|
August 14, 2023
|
|
|
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