Arnd Wiegmann/ReutersSwitzerland is famously well-fortified. Thousands of military bunkers and fortresses have dotted the Swiss landscape for the past century, but with no more real military use, they have all either been sold or repurposed.
Some have taken on second lives as hotels, restaurants, or food storage facilities - and about a thousand remain disguised as houses or barns, or have been converted into museums.
Below, take a tour around Switzerland to see what's happened to these former military strongholds, many of which have been hidden for decades.