Season 1
S1.E0 ∙ IstanbulS1.E1 ∙ Scotland's Sin CityS1.E2 ∙ Hitler's Underground LairS1.E3 ∙ Rome's Hidden EmpireS1.E4 ∙ Catacombs of DeathS1.E5 ∙ City of CavesS1.E6 ∙ New YorkS1.E7 ∙ London's Lost CitiesS1.E8 ∙ Beneath VesuviusS1.E9 ∙ Freemason UndergroundS1.E10 ∙ Dracula's UndergroundS1.E11 ∙ Secret Pagan UndergroundS1.E12 ∙ Underground BootleggersS1.E13 ∙ Rome: The Rise
Season 2
S2.E1 ∙ Underground ApocalypseS2.E2 ∙ VietnamS2.E3 ∙ A-Bomb UndergroundS2.E4 ∙ Viking UndergroundS2.E5 ∙ Hitler's Last SecretS2.E6 ∙ Maya UndergroundS2.E7 ∙ Mob UndergroundS2.E8 ∙ Prophecies from BelowS2.E9 ∙ New York: Secret SocietiesS2.E10 ∙ Washington, D.C.: Seat of PowerS2.E11 ∙ Stalin's Secret LairS2.E12 ∙ KatrinaS2.E13 ∙ Secret Soviet Bases
Season 3
S3.E1 ∙ City of BloodS3.E2 ∙ Okinawa: Tunnels of HellS3.E3 ∙ Real Mafia UndergroundS3.E4 ∙ Secret Sin CityS3.E5 ∙ Hitler's TrenchesS3.E6 ∙ Barbarian's LairS3.E7 ∙ Land of MansonS3.E8 ∙ Gladiators: Blood SportS3.E9 ∙ Secret Holy LandS3.E10 ∙ Under the RockS3.E11 ∙ Tomb of the Lost MummiesS3.E12 ∙ Gods of WarS3.E13 ∙ Alcatraz Down UnderS3.E14 ∙ The JFK Assassination
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