Schwerbelastungskörper

The Schwerbelastungskörper is a hefty concrete cylinder located at the intersection of Dudenstraße, General-Pape-Straße, and Loewenhardtdamm in the northwestern part of the borough of Tempelhof in Berlin, Germany. It was built by Hitler's chief architect Albert Speer to determine the feasibility of constructing large buildings on the area's marshy, sandy ground. Erected between 1941 and 1942 it was meant to test the ground for a massive triumphal arch on a nearby plot.

Source: Wikipedia