Anyone who’s spent anytime in the north of Switzerland quickly learns about the huge number of bunkers and fortifications erected to protect the border. Formally it’s known as the Swiss Redoubt, or the Réduit Suisse in French. But whereas many people believe this was motivated by World War II, in fact the efforts began somewhat earlier, in 1880.
Here is a rather ornate anti-tank fortification (Panzersperre),
I took this snap at Augusta Raurica in northern Switzerland, where it formed one side of a huge area for outdoor picnics and grill parties.