There have been some good posts recently on this thread about WWII-era concentration camps in Europe, and the emotional difficulty of even going there to confront that part of history.
This is a guard tower at the site of the Manzanar concentration camp in the Sierra Nevadas, near Independence, California. The “War Relocation Center” imprisoned nearly 11,000 Japanese Americans at its peak. In 1942, FDR signed the executive order that forced the relocation of some 120,000 people of Japanese descent, mostly on the West Coast, to 10 such camps like this, away from urban centers.