Fort Breendonk was built in the early 1900s to protect Antwerp, Belgium, from possible German invasion. Damaged at the start of World War I, it fell into disrepair . . . until the Nazis took it over after their invasion of Belgium in 1940. Never designated an official concentration camp by the SS and instead labeled a "reception" camp where prisoners were held until they were either released or transported, Breendonk was no less brutal. About 3,600...