Archaeologists Discover Medieval Tunnel in the Harz Forefield - Mysterious Medieval Tunnel Unearthed Near Ancient Pagan Burial Site in Germany

Archaeologists in Reinstedt, Germany, have uncovered a hidden medieval tunnel, known as an Erdstall, while preparing land for wind turbine construction. The discovery was made near a pagan burial site on Dornberg Hill, revealing a rare underground structure.

The tunnel, roughly seven metres long, stands between one and 1.25 metres high, with a width of 50 to 70 centimetres. Parts of it feature a pointed arch, a detail that aligns with late medieval architecture. At the entrance, a wall niche and a step were carved into the loess subsoil, though the opening itself had been sealed with a pile of large stones.

Inside, researchers found a horseshoe, a fox skeleton, and the remains of small mammals. A thin layer of charcoal indicated that a brief fire had once burned in the chamber. The Erdstall dates back to the 13th century, based on stratigraphic analysis, pottery fragments, and architectural style—though its exact purpose remains debated.

This Erdstall was first documented in the 20th century, but its recent rediscovery confirms that medieval builders often placed such tunnels near older, visible sites. The findings suggest a deliberate connection between the medieval structure and the earlier pagan burial ground.

The tunnel's discovery provides new insight into medieval construction practices and site selection. Its contents—from animal bones to a horseshoe—offer clues about its use, though many questions remain. Archaeologists will continue studying the structure to better understand its role in the region's history.