In Our Own Backyard: Resisting Nazi Propaganda In Southern California 1933 - 1945, a digital exhibition from the Oviatt Library at Cal State Northridge. "The Nazi Propaganda period, 1933 to 1945, chronicles a crucial twelve years in American history. This exhibit's story about the local threat to American ideals demonstrates how European events reached across the ocean and affected people in Southern California -- in our own backyard." Magazines, pamphlets, newspapers, stickers and more. [more inside]
Britain's Maunsell Sea Forts [wiki] were built during WWII as part of the coastal defense system. They were decommissioned in the 1950's, but many of them remain in use for non-military purposes (this is arguably the most famous). Some great photos here. [previously on metafilter]
Cats in Wartime on land, at sea, and memorialized. (With discussion of some of the most famous-- like Simon and Oscar.) Also, What Cats Know About War, previously on metafilter. [more inside]
"The “Monuments Men” [wiki] were a group of ... men and women from thirteen nations who comprised the Monuments, Fine Arts, and Archives section during World War II....Together they worked to protect monuments and other cultural treasures from the destruction of World War II. ...They tracked, located, and ultimately returned more than 5 million artistic and cultural items stolen by Hitler and the Nazis. Their role in preserving cultural treasures was without precedent. "