Hydrierwerke Pölitz

Constructed in 1937 in what was still considered Germany, this synthetic fuel manufacturing plant used high pressured hydrogenation processes to convert powdered lignite coal into liquid fuels. This included a good deal of high-grade gasoline. The process was called the Bergius process, named after its inventor and Nobel prizewinner, Freidrich Bergius. The plant was jointly owned by IG Farben, Rhenania-Ossag, and a German subsidiary of Standard Oil.

Throughout World War II, the plant also acted as a subcamp for the Stutthof, Sachsenhausen and Ravensbrück concentration camps, whose prisoners made up a majority of the plant's labor force. Between 1933 and 1945, Nazi Germany and its allies established more than 44,000 camps and other incarceration sites (including ghettos). They used these sites for a range of purposes, including forced labor, detention of people thought to be enemies of the state, and extermination. About 30,000 laborers were forced to work at Hydrierwerke Pölitz from 1939 to 1945. Around 13,000 died. 

The plant suffered from at least 12 major air raids (the last one involved 250 bombers). After the war, the site fell into the state of decay seen today. This was made even more complete when the Red Army overran the site. The Soviet army removed any surviving technical parts of the plant and sent them back to the USSR. 

The scale of the site is impressive. At its peak, the plant was producing a large amount of Germany's liquid fuels. Without this plant, Germany's initial success during WWII, particularly their invasion of Russia, would have been impossible.