A City Beneath the Streets
At first glance, Oppenheim appears to be a quiet town along the Rhine. But beneath its cobblestone streets lies a vast network of tunnels—some dating back to 700 A.D. Originally carved for wine and food storage, these underground passages stretch over 25 mapped miles, with more still hidden.
Built by Hand, Buried by Time
The tunnels were mainly dug during the 1600s using simple tools. During the Thirty Years’ War, residents used them to hide from invading Spanish troops and to protect the cathedral’s stained-glass windows. In 1689, Oppenheim was destroyed during the War of Palatine Succession. Afterward, the tunnels were filled in and forgotten.
Rediscovered by Accident
In the 1980s, a police car sank into a road during a storm, revealing a hidden tunnel. This collapse sparked a renewed exploration. Artifacts such as pottery shards and a rusted first aid kit have since been recovered and displayed.
From Cellars to Concert Halls
Some chambers now host events. One hall once stored water in the 1940s; another serves as a choir practice space. The labyrinth remains stable due to Oppenheim’s unique loess and limestone geology.
Beneath the German town of Oppenheim lies a hidden world: a vast maze of tunnels stretching over 25 known miles (40 km).
First dug centuries ago to store food and wine, these forgotten passageways were rediscovered after a police car fell through the road in the 1980s…🧵👇 pic.twitter.com/jR2tTBsJJn
— Detective Tiger's Stories (@TigerDetective) April 24, 2025