The Engelberg Tunnel is a motorway tunnel on the German A81 Autobahn just to the west of Stuttgart on the outskirts of Leonberg. During World War II it was used as a Nazi forced labor factory for the manufacture and storage of aircraft parts.
The name is sometimes used to refer to the Old Engelberg Tunnel - which was Germany's second ever motorway tunnel - and sometimes used to refer to its successor, the completely rebuilt lower Engelberg Tunnel. Both travel under the Engelberg hill to the east of Leonberg on the Stuttgart to Heilbronn A81 motorway.
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