The Urserental valley is seen behind a camouflaged canon at a former Swiss artillery fortress called Fuchsegg near the village of Realp, Switzerland August 6, 2015. Fuchsegg fortress, located in the central Swiss Alps, was built in 1943 and remained in military use until 1993. With the threat of foreign invasion a thing of the past, thousands of military bunkers and fortresses in Switzerland have been put to commercial use, from hotels to data centres, museums to cheese factories. The Swiss army has sold most of these decommissioned strongholds, but about a thousand unused bunkers remain, many still disguised as houses and barns. REUTERS/Arnd Wiegmann PICTURE 1 OF 27 - SEARCH "SWISS BUNKER" FOR ALL IMAGES