6.6/1018 votes#1 - Mayan Apocalypse
Season 4 Episode 1 - 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.
Director: N/A
Writer: N/A
6.2/1015 votes#2 - America's Military Underground
Season 4 Episode 2 - 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.
Director: N/A
Writer: N/A
6.5/1015 votes#3 - America's Unmapped Murder Tunnels
Season 4 Episode 3 - 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.
Director: N/A
Writer: N/A
6.1/1017 votes#4 - America's Ancient Ancestors
Season 4 Episode 4 - 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.
Director: N/A
Writer: N/A
7.5/1012 votes#5 - The Pirate Queen's Lair
Season 4 Episode 5 - 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.
Director: N/A
Writer: N/A
6.7/1010 votes#6 - Templars and The Founding Fathers
Season 4 Episode 6 - 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
Director: N/A
Writer: N/A
7.2/108 votes#7 - Secrets of the Ancient Metropolis
Season 4 Episode 7 - 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.
Director: N/A
Writer: N/A
7.3/1010 votes#8 - The Lost Aztec Colony
Season 4 Episode 8 - 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.
Director: N/A
Writer: N/A
The Best Episodes of Cities of the Underworld Season 4
Every episode of Cities of the Underworld Season 4 ranked from best to worst. Discover the Best Episodes of Cities of the Underworld Season 4!
Don Wildman travels to the farthest and deepest reaches of the globe, using cutting-edge technology to explore mysteries buried deep underground.
Genre:Documentary
Season 4 Ratings Summary
"Mayan Apocalypse" is the best rated episode of "Cities of the Underworld" season 4. It scored 6.6/10 based on 18 votes. Directed by N/A and written by N/A, it aired on 9/7/2021. This episode is rated 0.4 points higher than the second-best, "America's Military Underground".