Police Historical CollectionR4 Get an idea of how police officers work in the police headquarters! Officers from different departments are ready to answer your questions. Hear about Ernst Gennat, who in 1926 established the first homicide commission in the world and convicted numerous serial murderers. Let the portraitist capture your likeness. In the foyer of the police headquarters the Berlin police's former motorbike sport group greets you. And we'll also cater to your refreshment needs.