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A sign reads "Military site - Entering and photography forbidden" at former Swiss artillery fortress Sasso da Pigna on the St. Gotthard mountain pass, Switzerland August 6, 2015. Sasso da Pigna fortress, located at 2,106 m (6,909 ft) altitude on the St. Gotthard mountain pass, was built from 1941 to 1945 and remained in military use until 1999. Since 2012 it has been open to the public as Sasso San Gottardo museum. (Photo by Arnd Wiegmann/Reuters)
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