https://www.warhistoryonline.com/war-articles/rare-wwii-disappearing-pillbox-discovered-evanton.html
Rare wartime Pickett-Hamilton fort found at Evanton
Dec 22, 2013 - A rare surviving relic from the World War II, the Pickett Hamilton "disappearing pillbox", was found at Evanton by a wartime remains project.
pickett hamilton fortrarewartimefoundevanton