What Was an Erdstall? The Hidden Tunnels Medieval Peasants Dug Under Their Own Homes

From Medieval Way

Medieval Way investigates the mysterious 'Erdstall' tunnels found across Europe. Despite meticulous 3D mapping and carbon dating, the exact purpose of these hand-carved, narrow subterranean passages remains an enigma. Experts and explorers examine various theories, ranging from defensive refuges to spiritual soul houses, to understand why these structures were built and subsequently concealed.

On a summer morning in the hills outside Glonn, southeast of Munich, a dairy farmer named Beate Greithanner was walking her cattle across a meadow her family had crossed for generations. One of her cows stepped forward, and the ground swallowed it to the hips. The earth had simply opened. Beneath the grass, running under her own land, was a labyrinth of hand-carved passages that nobody alive had known was there. It runs at least eighty feet. It is most likely a thousand years old. And it is one of roughly two thousand of these tunnels hidden under the farms, fields, churches, and forests of Central Europe.

Around seven hundred of them sit beneath Bavaria. Another five hundred beneath Austria. The rest are scattered through the Czech Republic, Slovakia, France, and as far as the British Isles. The people who dug them left almost nothing behind. No blueprints, no letters, nothing written down to explain the work. They carved the walls smooth, threaded the passages with holes so tight a grown man can barely force his shoulders through, sealed each system behind a single concealed entrance, and then walked away. Why would anyone do that?