these are bunkers or other parts of the MiMo:
Mitteldeutsche Motorenwerke GmbH (MMW, also MiMo) was a company that existed from 1935 to 1948 and was based in Leipzig (from 1939 Taucha), which belonged to the Auto Union group. The MiMo manufactured Junkers aircraft engines under license and were the third largest Auto Union plant after Horch in Zwickau and the Siegmar plant (formerly Wanderer) near Chemnitz.
The factories were located northwest of Taucha in a forest area that partly belonged to Leipzig-Portitz. The production program essentially included the types Junkers Jumo 205, Jumo 211, Jumo 213 and parts for the jet turbine Jumo 004. At that time, 10,000 employees (including slave labor) were employed. The works were partially dismantled as an armaments factory after the end of the war in 1947, the remains were blown up. The company was deleted from the commercial register of the Leipzig District Court on August 27, 1948.
Source: Wikipedia