It's History
S01:E06 - Nuclear Secrets Under Poland: The Cold War Bunker Hidden in Plain Sight
S01:E01 - Poland's Lost Gold Mine: 400 Feet Into Medieval Europe
At its peak, the Zloty Stok gold mine produced nearly 8% of all the gold in Europe — then it vanished from history. We descend 400 feet into a thousand-year-old labyrinth of flooded tunnels, underground waterfalls, and active mine railways to find out why.
S01:E02 - 1,000 Feet Down: Inside Europe's Ancient Salt Mine
Nearly 1,000 feet beneath southern Poland lies a UNESCO World Heritage site that most Americans have never heard of — the Bochnia Salt Mine, dug by hand starting in the 13th century and still largely off-limits today.
S01:E03 - 180 Miles of Secrets: The Lost Tunnels of Wieliczka
Beneath a quiet Polish town lies 180 miles of tunnels — chapels carved entirely from salt, a vast cathedral, an underground lake, and decades worth of sealed-off shafts that are only now being rediscovered.
S01:E04 - The Silo City: How Oslo Turned an Abandoned Grain Tower Into Homes
When Oslo's industrial grain silos shut down, the city faced a question most American cities never bother asking: what do you do with a 100-foot concrete tower in the middle of an urban neighborhood?
S01:E05 - The Vasa: Sweden's Warship That Sank on Its First Day
In 1628, Sweden spent a fortune building the most powerful warship in the world. The Vasa set sail on its maiden voyage — and sank within 20 minutes, in full view of the Stockholm harbor crowd.
S01:E06 - Nuclear Secrets Under Poland: The Cold War Bunker Hidden in Plain Sight
Beneath an ordinary-looking building in a mid-sized Polish city sits one of the most intact Cold War bunkers in Europe — built to survive a nuclear strike and almost completely unknown to the outside world.
S01:E07 - The Forbidden Fortress: WWI's Largest Fort on the Ukrainian Border
On the edge of what is now the Polish-Ukrainian border sits the ruins of one of the most ambitious military fortifications ever built — a fortress so large it was essentially its own city.
S01:E08 - The UFO Bridge: How Slovakia Destroyed Its Own History to Build an Icon
Perched above the Danube in Bratislava is a bridge that looks like a flying saucer — and the story of how it got there is one of the most controversial decisions in European urban history..
S01:E09 - The Castle With 99 Towers: Poland's Most Mysterious Fortress
Moszna Castle has 99 towers. Nobody agrees on why. Built across multiple centuries by Polish nobility, the castle accumulated wings, turrets, and additions until it became something that looks more like a fever dream than an architectural plan.
S01:E10 - The Underground Canal: By Boat, 131 Feet Beneath the Industrial Revolution
In the 19th century, engineers in what is now Poland built a freight canal underground — not a river, not a tunnel, but an actual navigable waterway carved 131 feet beneath the city of Zabrze to move coal from mines to markets across Europe.
S01:E11 - Frozen in 1939: Inside the Abandoned Nazi Palace Nobody Talks About
Deep in the forests of northeastern Poland stands Schlobitten Palace — a 17th-century aristocratic estate that was one of Prussia's grandest homes, until the Nazi occupation of Poland left it damaged, abandoned, and slowly swallowed by the forest.
S01:E12 - Malbork Castle: What's Buried Beneath the World's Largest Castle
Malbork Castle is the largest castle on earth by land area — a 13th-century Teutonic Knights fortress in northern Poland that most Americans have never heard of. But the story above ground is only half of it.