Infanteriewerk Grynau A 6913, also known as Art Beob Pz Turm, is a Swiss military bunker located in the Canton of Schwyz. This defensive structure was part of Switzerland's extensive network of fortifications designed to protect the country's strategic locations during the Cold War era. Situated near the Grynau Castle, the bunker served as an observation and artillery control post, monitoring the surrounding area and coordinating defensive operations.
The site exemplifies Switzerland's policy of armed neutrality and its commitment to maintaining a robust defensive infrastructure.