Erdstall, Medieval tunnel system in Rot am See, Germany.
The Erdstall is a tunnel system beneath Rot am See consisting of narrow passages with oval cross-sections. The ceilings sit roughly 1.5 meters high, and at several points visitors must crawl on hands and knees to pass through.
The system was constructed between the 10th and 12th centuries, as carbon dating of fire pit samples confirms. Its exact purpose remains unclear, but evidence suggests use for storage or shelter.
The name 'Erdstall' refers to these underground passages that locals have mentioned across centuries. Visitors can observe how confined and low the spaces are, indicating they were designed only for brief stays.
The underground temperature stays cool and constant year-round regardless of season. Visitors should prepare for confined spaces and may need a flashlight, as natural light does not penetrate below.
In the deepest sections of the system, carved stone benches appear despite extreme space limitations and complete darkness. This suggests people intentionally spent time in these uncomfortable spaces.
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