Cities of the Underworld Season 4 Episode 3
America's Unmapped Murder Tunnels
Don uses brand-new mapping technology to expose the dark and deadly uncharted spaces beneath American cities. He explores the criminal underworld below Portland, Oregon; Seattle, Washington; Chicago, Illinois; and Los Angeles, California.
4 - 8The Lost Aztec ColonyOct. 26, 2021- 4 - 7Secrets of the Ancient MetropolisOct. 19, 2021
- 4 - 6Templars and The Founding FathersOct. 12, 2021
- 4 - 5The Pirate Queen's LairOct. 05, 2021
- 4 - 4America's Ancient AncestorsSep. 28, 2021
- 4 - 3America's Unmapped Murder TunnelsSep. 21, 2021
- 4 - 2America's Military UndergroundSep. 14, 2021
- 4 - 1Mayan ApocalypseSep. 07, 2021
