O the surface, Oppenheim looks like your typical German town resting along the banks of the Rhine River. But there's more to Oppenheim than beer halls and a Gothic-style cathedral from the Middle Ages. Beneath its narrow cobblestone streets lies something deeper—an entire labyrinth of tunnels and cellars.
“The town is practically honeycombed with cavities,” Wilfried Hilpke, a tour guide with Oppenheim’s tourism office, tells Smithsonian.com.
Hilpke should know. For the past ten years, he’s spent much of his time leading hour-long hardhat tours of Oppenheim’s elaborate tunnel system, taking visitors through a journey that covers just a fraction of the 25 miles of known tunnels residing beneath the surface. (It’s believed that there could be more than 124 miles of tunnels underneath the town, which is located 30 miles southwest of Frankfurt. However, many sections remain uncharted; they are thought to lead to private cellars beneath residents’ homes.)
Not only are the Kellerlabyrinth tunnels long in distance, but their history is equally deep. According to Hilpke, some of the oldest tunnels date back to 700 A.D. The tunnels got their start as food and wine storage cellars, and workers carved out the bulk of them using pickaxes and shovels during the 1600s, when residents were in need of extra storage space and channels to transport goods like wine. The tunnels took on a secondary purpose when the city's inhabitants used them to hide from Spanish troops during the Thirty Years' War. (They also used them to store Katharinenkirche cathedral’s stained glass windows to protect them during that war's bombardments.)
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