Brutalism is one of the most recognizable architectural movements of the twentieth century. It became especially influential from the 1950s through the 1970s. Its name comes from the French expression béton brut, meaning "raw concrete." The term does not mean that the buildings are necessarily brutal or violent. Instead, it refers to an approach in which materials and construction are allowed to remain visible.

Brutalist buildings often have massive geometric forms, repetitive patterns, deep shadows and exposed structural elements. Concrete is frequently used, but the movement is not simply about using concrete. It is also about expressing how a building works. Rather than hiding pipes, supports or structural systems behind decorative surfaces, architects may make these elements part of the design.

Berlin is an especially interesting city for exploring this architecture. After the Second World War, the city was divided into East and West. The two political systems developed different approaches to public buildings, housing and urban planning. Modern architecture became part of the way each side represented its ideas about society and the future.

One of Berlin's most unusual buildings is the Mäusebunker in Steglitz. It was designed by Gerd and Magdalena Hänska as a central animal research laboratory. Planning began in the 1960s, construction took place mainly between 1971 and 1981, and the building was completed in 1981. Its exterior is covered with dramatic concrete forms, ventilation structures and unusual openings. The result has often been compared to a battleship or a science-fiction spacecraft.

The building's appearance is closely connected to its original function. It was designed for complex scientific work, including animal breeding and experiments. Its distinctive outer shell and technical systems were not simply decorative. They helped express the complicated and highly controlled activities taking place inside. The building stopped operating as a research facility in 2020, and its future use has become a subject of architectural debate. It was placed under heritage protection in 2023.

Another important example is St. Agnes Church in Kreuzberg. Designed by Werner Düttmann, it was built between 1964 and 1967. From the outside, it looks like a monumental, almost windowless concrete block. The architect deliberately avoided the familiar image of a traditional church. Instead, the building creates a quiet, enclosed atmosphere through its scale, simple forms and controlled use of light.

St. Agnes is no longer used as a parish church. After the congregation gave up the building, it was converted into an art gallery. This is an example of adaptive reuse: an existing building is given a new function while important parts of its original architecture are retained.

Berlin's architectural landscape also includes buildings that are sometimes grouped with Brutalism or post-war modernism, even when their materials and forms are different. The Bierpinsel, for example, is a striking tower with a tree-like silhouette. Kino International on Karl-Marx-Allee is another landmark of East Berlin's post-war architecture. These examples show why architectural styles are not always easy to define with one label.

Today, many Brutalist buildings are being reconsidered. Some people see them as unattractive, cold or intimidating. Others value their honesty, craftsmanship and strong visual identity. When a building is no longer needed for its original purpose, the question becomes whether it should be demolished, renovated or adapted for a new use. In Berlin, that debate is part of a larger discussion about memory, architecture and the future of the city.