- 3.1Flakturm I – Berliner Zoo, Berlin
- 3.2Flakturm II – Friedrichshain, Berlin
- 3.3Flakturm III – Humboldthain, Berlin
- 3.4Flakturm IV – Heiligengeistfeld, Hamburg
- 3.5Flakturm VI – Wilhelmsburg, Hamburg
- 3.6Flakturm V – Stiftskaserne, Vienna
- 3.7Flakturm VII – Augarten, Vienna
- 3.8Flakturm VIII – Arenbergpark, Vienna
Planned towers (not built)
Retribution given thru above links
The Penitentiary/Asylum on Blackwell’s Island, now Roosevelt Island, in the 1910s. Built in 1832, it was demolished in the 1930s.
The Fenestrelle Fortress, better known as the Fenestrelle Fort is a fortress overlooking Fenestrelle. It is the symbol of the Metropolitan City of Turin, Piedmont, northern Italy. It is the biggest alpine fortification in Europe, having a surface area of 1,300,000 m². The fortress, built by Savoy between 1728 and 1850 under the design of the architect Ignazio Bertola, guards the access to Turin via the Chisone valley and stands at altitudes between 1,100 and 1,800 m. The territory was acquired in 1709 by the Duchy of Savoy (later known as the Kingdom of Sardinia) after the defeat of the French at Fort Mutin (Fenestrelle).