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I found some information in a German speaking forum:
Das Gebiet der Schweiz stiess an zwei Punkten unmittelbar an die Fronten, an der Grenze des heutigen Juras bei Pruntrut an die deutsch-französische Front und ab 1915 beim Stilfserjoch im Südosten Graubündens an die italienisch-österreichische Front.
Rough Translation:
There were two connections to the front. One at the border at Prupunt (German-French front) and from 1915 one at the Stilfserljoch (Italian-Austrian front).
Some pictures from fortifications are at Wikipedia (but not from the direct border).
There is also an article where WW1-front lines in Alsace reached Switzerland with an overview of the Western Front; the Swiss-Alsatian area is marked.
There is also a website about the "Sundgaufront" with maps of the front (German: 'Frontkarte').