Street art on the the flak tower in Arenberg Park (3rd district of Vienna)

Flak Towers were 8 complexes of large, above-ground, anti-aircraft gun blockhouse towers constructed in the cities of Berlin (3), Hamburg (2), and Vienna (3) from 1940 onwards. Other cities that had flak towers included Stuttgart and Frankfurt. Due to the very close neighbouring buildings some of the flak towers could not be blown up after World War II.

Photo
Vienna 2015