U-bahn subway station sign in new urban development in Potsdamer Platz, Berlin, Germany, Europe

architecture berlin building business district color image dusk europe germany highrise illumination long exposure mass transit modern new urban development night nobody outdoors photography potsdamer platz senior woman sign street subway subway station text transportation travel travel destinations u bahn urban vertical capital color colour contemporary eu eu european european union evening german metropolitan nighttime outside public transportation road signage skyscraper structure time exposure time lapse tower transporting underground western europe western european word