Hidden Beneath the Cities “Tunnels and Tombs” S1E4 May 1 2026 on National Geographic

On Friday May 1 2026, National Geographic broadcasts Hidden Beneath the Cities!
Tunnels and Tombs Season 1 Episode 4 Episode Summary
The upcoming episode of “Hidden Beneath the Cities,” titled “Tunnels and Tombs,” promises an exciting exploration of underground worlds. This episode will take viewers on a journey through a famous tunnel system in a historic neighborhood in Florida. The brick-lined tunnels, known for their intriguing history, hold secrets from the past that are waiting to be uncovered.
In Naples, Florida, the show will reveal the lives of elite Greek families who once thrived in the area. By exploring the historical context and the architecture of their homes, viewers will gain insight into the culture and lifestyle of these families. The episode aims to connect the past with the present, showing how history shapes communities.
The adventure continues as the show travels to Iran, where a remarkable three-story underground city will be explored. This hidden city offers a glimpse into ancient life, showcasing how people adapted to their environment. The intricate design and construction of this underground space highlight the ingenuity of those who lived there.
Finally, the episode will take a trip to Rome, where 2nd-century barracks lie buried beneath the city. These barracks tell a story of Roman military life and provide a fascinating look at the daily routines of soldiers in ancient times. “Tunnels and Tombs” promises to be a captivating episode filled with history, exploration, and discovery, making it a must-watch for fans of the series.
What Time is the “Tunnels and Tombs” Episode On?
The Tunnels and Tombs episode of Hidden Beneath the Cities will be broadcast on May 1 2026 on National Geographic at 10:00 PM at ET/PT.
Is the “Tunnels and Tombs” Episode New?
The Tunnels and Tombs episode of Hidden Beneath the Cities is all new!
Hidden Beneath the Cities Tunnels and Tombs Cast & Stars
No cast information available yet.
Tunnels and Tombs Episode Videos & Previews
Watch Hidden Beneath the Cities Tunnels and Tombs Online
Watch Hidden Beneath the Cities on National GeographicHidden Beneath the Cities Series Information
Hidden Beneath the Cities is a National Geographic documentary series that explores the hidden infrastructure beneath major urban areas. Using engineering insights, visuals, and expert commentary, the show examines what lies below—such as tunnels, water systems, and other subterranean structures—and explains how they affect life above ground. It focuses on the history, construction, and ongoing significance of these underground networks.
