Fort Heldsberg was built 1938–1940 near St. Margrethen in Switzerland, overlooking the Rhine, which forms the Swiss-Austrian border at that location, just south of Lake Constance. The fort was part of the Swiss Border Line defenses, built between 1938 and 1941.
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Official Website http://www.festung.ch/
Phone +41 71 744 82 08
Coordinates 47°26'35.743" N 9°38'35.68" E
