Erdstall
An erdstall is a type of tunnel found across Europe. They are of unknown origin but are believed to date from the Middle Ages.
An erdstall is a type of tunnel found across Europe. They are of unknown origin but are believed to date from the Middle Ages.
An erdstall is a type of tunnel found across Europe. They are of unknown origin but are believed to date from the Middle Ages.
Source: Wikipedia "Erdstall" · CC BY-SA 4.0
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