Sperrstelle Chlus, Military fortress in Graubünden, Switzerland.
Sperrstelle Chlus is a military fortress in the mountainous region of Graubünden built into rock with multiple bunkers and tunnel systems. The installation was designed as a defensive position with several levels containing artillery positions and ammunition storage areas.
The fortress was built between 1937 and 1942 as part of Swiss defense strategy against possible invasions during World War II. It served as a blocking position to protect the strategically important mountain valley and was one of many similar works along the country's borders.
The fortress displays Swiss engineering from the 20th century, with concrete and steel structures built directly into the mountain. Visitors can see the original rooms and their functional layouts that remain unchanged since that era.
The fortress is accessible only through guided visits since many areas have narrow and low passages. Those with mobility restrictions should check beforehand which sections of the installation are accessible.
Inside the fortress is an approximately 160-meter-long infantry barracks carved entirely from rock. This hollow space provided room for soldiers, ammunition, and equipment all within one protected location.
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