Cities of the Underworld - Season 4

First aired: 9/7/2021 8 episodes

Episodes

1. Mayan Apocalypse

Aired: 9/7/2021

Don Wildman explores deep below ancient ruins as he searches for clues pointing to the true fate of the once-mighty Mayan empire.

2. America's Military Underground

Aired: 9/14/2021

Don explores top-secret military and government tunnels and looks into classified technology that could be used to build entire cities... right under our feet.

3. America's Unmapped Murder Tunnels

Aired: 9/21/2021

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. America's Ancient Ancestors

Aired: 9/28/2021

Don goes deep beneath the great lakes and explores flooded caves as he searches for evidence of a mysterious, cave-dwelling society that may have been the first people to reach America.

5. The Pirate Queen's Lair

Aired: 10/5/2021

Don explores newly discovered ruins and caves in Croatia as he uncovers the true story of a formidable queen who dared to defy the mighty Roman Empire.

6. Templars and The Founding Fathers

Aired: 10/12/2021

Don goes deep beneath a Knights Templar stronghold in Turkey to explore a provocative theory that may link the fabled secret society to the founding fathers of America. English

7. Secrets of the Ancient Metropolis

Aired: 10/19/2021

Don explores the massive underground cities in the mountains of Turkey that may have been home to the first civilization on Earth.

8. The Lost Aztec Colony

Aired: 10/26/2021

Don follows the clues hidden underground as he searches for evidence of 10,000 Aztecs who fled Mexico and disappeared somewhere in America.