These above-ground bomb shelters were officially called Winkeltürme (Winkel Towers) after their designer, architect Leo Winkel.
Nicknamed “concrete cigars” or “sugar beet heads,” about 200 of these air raid shelters were built in Germany during World War II. The highest concentration of them was in Zossen.

A Winkelturm Type 2A could accommodate over 150 people.

A ventilation plug that could be closed from the inside.