E1
Underground Cities and Secret Chambers
45m Apr 24, 2026
Scientists uncover a city, a chamber, and a complex, and map a tunnel network.
E2
Crystal Cathedrals and Buried Bunkers
45m Apr 24, 2026
Scientists uncover salt chambers, bunkers, old kingdoms, and mysterious caves.
E3
Hidden Hypogeum and Lost Letters
45m May 1, 2026
Investigate a tomb in Naples that may contain a prince who inspired the legend of Dracula. Read the desperate letters of Jewish rebels hidden in an Israeli cave, tour a 6,000-year-old labyrinth in Malta, and see the oldest human burial in Africa.
E4
May 1, 2026
Crawl through a notorious brick-lined tunnel system in a historic Florida neighborhood. Open a window into the lives of elite Greek families in Naples, explore a three-story underground city in Iran, and find 2nd-century barracks buried in Rome.
E5
Labyrinths and Legends
45m May 8, 2026
Explore a labyrinth built beneath Washington, D.C., by an eccentric entomologist. Admire a fresco-filled Roman mausoleum, spot intricate chambers carved into Colombia's volcanic rock, and see a sprawling network of hand-dug tunnels in Liverpool.
E6
Subterranean Secrets and Forgotten Foundations
45m May 8, 2026
Walk the service tunnels hidden beneath Emperor Hadrian's lavish villa in Italy. Uncover a chilling mass grave from the Thirty Years' War in Germany, find the foundations of a Roman basilica in London, and glimpse Neolithic life on a Danish island.
E7
Buried Battleship and Viking Victims
45m May 15, 2026
Examine a Revolutionary War-era ship found in the rubble of the World Trade Center. Uncover a mass grave of Viking settlers in Oxford, visit the resistance bunkers of the Warsaw Ghetto Uprising, and tour a necropolis full of burial jars in Corsica.
E8
Bones Beneath and Coffins & Coins
45m May 15, 2026
Dig beneath the Treasury in Petra, Jordan, to find a sealed tomb containing 12 skeletons; unearth a hoard of coins hidden during a Scottish massacre, question the purpose of an empty grave in Peru, and inspect a Bronze Age leader's coffin in England.
E9
Subterranean Seoul and Railway Revealed
45m May 22, 2026
Discover a massive underground chamber hiding under the Seoul subway. Visit a medieval knight's limestone tomb in Poland, examine Roman ruins beneath a church in England, and ponder the identity of a 10-million-year-old fossil in Los Angeles.
E10
Secret School and Concealed Castle Cemetery
45m May 22, 2026
Visit a strange wood-lined tunnel beneath a Copenhagen train station. Locate one of North America's earliest schools for Black children in Virginia, excavate a warrior cemetery in Finland, and unearth a women-only burial plot beneath a Welsh castle.
