Berlin's "Walk of Fame" is located on Potsdamerstrasse and is known as the Boulevard der Stars. It features bronze stars set into the sidewalk to honor Germany's greatest film actors. One unique feature of the Walk of Fame is the Pepper's Ghost Cameras, which project holographic images of the celebrities above their stars, allowing visitors to take selfies with German's most famous actors. This area was historically popular and busy even before the war, as it sits at the crossroads of five streets. In 1920, the world's first traffic lights were installed here.