I’ve known about escape maps—maps printed on silk to help prisoners of war escape Germany during the Second World War—for a while now, and have blogged about them before, but this Atlas Obscura piece on them taught me a few things I didn’t know, and is a fascinating read besides.

See also this article from the British Library, from last October. And in case you missed it, a book on the subject, Barbara Bond’s Great Escapes: The Story of MI9’s Second World War Escape and Evasion Maps (Times Books), came out last year.

Previously: Dress Made from Silk Escape Maps Sold; Three Books on WWII Maps; World War II Escape Maps.