Beobachtungsturm (observation tower) at the Berlin Wall, near Fontanestraße Wilhelmsruh Berlin. This was officially called a ‘BT-11′, BT standing for Beobachtungsturm, and 11 for the height of the supporting column in meters. The shorter ones were BT-6.
Info from Wikipedia. (By the way, I donate money to Wikipedia whenever they ask me to, which I hope allows me to use their material)
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