A former control room is seen at a decommissioned Swiss military command bunker near Attinghausen, Switzerland September 2, 2015. Deltalis data centre offers high-security storage of data in server rooms inside the former command bunker, which was built in 1948. 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 17 OF 27 - SEARCH "SWISS BUNKER" FOR ALL IMAGES