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Re:Hitler’s Flak Towers Were Anti-Aircraft Castles by vermontdevil on Monday June 29, 2015 @08:06PM (#9802024)
Wikipedia has a great section on this including lots of photos:

https://en.wikipedia.org/wiki/Flak_tower

Re:Hitler’s Flak Towers Were Anti-Aircraft Castles by icc97 on Tuesday June 30, 2015 @06:10AM (#9804078)
Very interesting, one of the images [1] gives some good blue prints for the geek's version of a sand castle.

[1]: https://upload.wikimedia.org/wikipedia/commons/thumb/d/d7/Fl...