WW2 Flak tower exploration in Vienna

Flak towers (German: Flaktürme) were eight complexes of large, above-ground, anti-aircraft gun blockhouse towers constructed by Nazi Germany in the cities of Berlin (3), Hamburg (2), and Vienna (3) from 1940 onwards. further information: https://en.wikipedia.org/wiki/Flak_to... more detailed (but in German only: Flakturm https://de.wikipedia.org/wiki/Wiener_... our Instagram:   / beneathasteelsky