When a team excavated a Roman couple’s tomb near the city of Speyer, Germany, in 1867, they discovered several bottles, but only one—now known as the Speyer Wine Bottle—still contained liquid. Dating back as early as 325 CE, the wine has evolved from what was likely a blend of local grapes, herbs, and olive oil into a dark, resin-like mass and cloudy liquid. And just how did this liquid keep while others from the era evaporated? It’s all thanks to the wax seal and the large amount of olive oil, which helped further seal the liquid off from air.

To witness the effects of such extreme aging up close, you can see the Speyer Wine Bottle at the Historical Museum of the Palatinate in Speyer. As you take in the dolphin-shaped handles, green-yellow glass, and murky, layered contents, try imagining how it might taste. While it’s no longer alcoholic, researchers have said that it is still probably safe to drink. Not that anyone is planning on pouring a glass anytime soon: Museum curators have kept it sealed to avoid disturbing the miraculously preserved liquid.

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