- S1.E0 ∙ Istanbul
- S1.E1 ∙ Scotland's Sin City
- S1.E2 ∙ Hitler's Underground Lair
- S1.E3 ∙ Rome's Hidden Empire
- S1.E4 ∙ Catacombs of Death
- S1.E5 ∙ City of Caves
- S1.E6 ∙ New York
- S1.E7 ∙ London's Lost Cities
- S1.E8 ∙ Beneath Vesuvius
- S1.E9 ∙ Freemason Underground
- S1.E10 ∙ Dracula's Underground
- S1.E11 ∙ Secret Pagan Underground
- S1.E12 ∙ Underground Bootleggers
- S1.E13 ∙ Rome: The Rise
- S2.E1 ∙ Underground Apocalypse
- S2.E2 ∙ Vietnam
- S2.E3 ∙ A-Bomb Underground
- S2.E4 ∙ Viking Underground
- S2.E5 ∙ Hitler's Last Secret
- S2.E6 ∙ Maya Underground
- S2.E7 ∙ Mob Underground
- S2.E8 ∙ Prophecies from Below
- S2.E9 ∙ New York: Secret Societies
- S2.E10 ∙ Washington, D.C.: Seat of Power
- S2.E11 ∙ Stalin's Secret Lair
- S2.E12 ∙ Katrina
- S2.E13 ∙ Secret Soviet Bases
- S3.E1 ∙ City of Blood
- S3.E2 ∙ Okinawa: Tunnels of Hell
- S3.E3 ∙ Real Mafia Underground
- S3.E4 ∙ Secret Sin City
- S3.E5 ∙ Hitler's Trenches
- S3.E6 ∙ Barbarian's Lair
- S3.E7 ∙ Land of Manson
- S3.E8 ∙ Gladiators: Blood Sport
- S3.E9 ∙ Secret Holy Land
- S3.E10 ∙ Under the Rock
- S3.E11 ∙ Tomb of the Lost Mummies
- S3.E12 ∙ Gods of War
- S3.E13 ∙ Alcatraz Down Under
- S3.E14 ∙ The JFK Assassination

Cities of the Underworld (2007)
As we descend beneath our modern day cities, we are met with ancient and hidden secrets. Journey with us back through history and rediscover cities of the underworld.
Released: 2007
You may also like
Murder Most Puzzling (2025)
2025
S1.E3
TV
TechTalk (2019)
2019
S1.E12
TV
Abyss Dweller (2025)
2025
S1.E1
TV
Oh My Ghost Clients (2025)
2025
S1.E10
TV
Tales to Keep You Awake (1966)
1966
S2.E8
TV
The Waterfront (2025)
2025
S1.E8
TV
Between Walls (2025)
2025
S1.E10
TV
Suspicious Minds (2025) 2025
2025
S1.E6
TV
Shifty (2025)
2025
S1.E5
TV
Goldie (2025)
2025
S1.E13
TV
Scotland's Game (2016)
2016
S1.E4
TV
Charlotte (2015) 2015
2015
S1.E14
TV
Toxic (2025) 2025
2025
S1.E6
TV
The Sandbaggers (1978)
1978
S2.E6
TV
Britain's Treasure Islands (2016)
2016
S1.E4
TV
The Gilgo Beach Killer: House of Secrets (2025)
2025
S1.E3
TV