Like the capital, Berlin, the German port city of Hamburg was fortified with two concrete Flak Towers ('Flaktürme' in German) between 1942 and 1944.
On the night of April 25 to 26, 1940, the British Royal Air Force bombed the German capital Berlin. For Nazi leader Adolf Hitler, it was unpalatable to have bombs hit the capital of his Third Reich.
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On the occasion of International Art Nouveau Day, celebrated each year on June 10, a look at how this ornate architectural movement found its way into the most unlikely of places like coal mines, power stations, and railway yards and the long, sometimes heartbreaking battles to save what remains.
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