Exterior of Kollhoff Tower and Deutsche Bahn Tower at night, Potsdamer Platz, Berlin, Germany, Europe

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

Potsdamer Platz at night from left to right, Renzo Piano Tower, Hans Kollhoff Tower, Bahn Tower, Beisheim Center, Delbrueck Tower, Potsdamer Platz, Berlin, Germany, Europe

Cars and S-Bahn on the Oberbaum Bridge in the evening, Berlin, Germany, Europe

Potsdamer Platz, from left to right, Renzo Piano Tower, Hans Kollhoff Tower, Bahn Tower, Berlin-Mitte, Berlin, Germany, Europe

Bahn Tower and Beisheim Center at Potsdamer Platz, Berlin, Germany

Potsdamer Platz square with the Berliner Philharmonie Concert Hall, DB Tower, Sony Center and Kollhoff Tower, Berlin, Germany, Europe

Potsdamer Platz square with DB Tower, Sony Center and Kollhoff Tower, Berlin, Germany, Europe

Rapid-transit railway sign, in the background: Bahn Tower at Potsdamer Platz, Berlin, Germany, Europe

Potsdamer Platz, Potsdam Square at night, Berlin, Germany, Europe

High-rise buildings, Debis, Kolhoff and DB Tower skyscrapers and entrance to the S-Bahn train station at Potsdamer Platz, in Berlin, Germany, Europe

Skyscrapers on Potsdamer Platz square with subway and tram entrance, Piano high-rise building, Kollhoff high-rise building, Chrysler Building, Sony Center, Deutsche Bahn Tower and Beisheim Center with Ritz Carlton Hotel, Tiergarten district, Berlin, Germa

German railways tower at night Potsdamer Platz, Berlin, Germany

Three high-rise buildings at Potsdamer Platz Square, architectural detail, from ltr, PwC, PricewaterhouseCoopers, Kollhoff-Tower, BahnTower, Berlin, Germany, Europe

S-Bahn station Jannowitzbrücke on the Spree, twilight, Berlin Mitte, Berlin, Germany, Europe

DaimlerChrysler quarter, Kohlhoff Tower, Bahn Tower and historic traffic lights, Potsdamer Platz, Berlin, Germany, Europe

View from Leipziger Platz square on Potsdamer Platz square with Deutsche Bahn German Railways Tower and the Beisheim Center buildings, Mitte district, Berlin, Germany, Europe

Tower block at night, Potsdamer Platz, Berlin, Germany

Potsdamer Platz, Deutsche Bahn Tower, Berlin, Germany

U-Bahn U1 train on Oberbaumbruecke bridge crossing the Spree River in the evening light, Friedrichshain-Kreuzberg, Berlin, Germany, Europe

Skyscrapers on Potsdamer Platz square, Kollhoff high-rise building, Chrysler Building, Sony Center, Deutsche Bahn Tower, Tiergarten district, Berlin, Germany, Europe

Skyscrapers on Potsdamer Platz square, the Chrysler Building, the Sony Center, Deutsche Bahn Tower and Beisheim Center with Ritz Carlton Hotel, Tiergarten district, Berlin, Germany, Europe

Skyscrapers on Potsdamer Platz square in winter, the Chrysler Building, the Sony Center, Deutsche Bahn Tower and Beisheim Center with Ritz Carlton Hotel, Tiergarten district, Berlin, Germany, Europe

Potsdamer Platz left to right: Quartier DaimlerChrysler, Kollhoff-Tower, Bahn-Tower, Beisheim-Center, S-Bahn sign, Berlin, Germany, Europe

Skyscrapers on Potsdamer Platz square, the Chrysler Building, the Sony Center, Deutsche Bahn Tower and Beisheim Center with Ritz Carlton Hotel, Tiergarten district, Berlin, Germany, Europe

View from Leipziger Platz square on Potsdamer Platz square with Deutsche Bahn Tower and Sony Center, Mitte district, Germany, Europe

Skyscrapers on Potsdamer Platz square, Deutsche Bahn Tower and Beisheim Center with Ritz Carlton Hotel, Tiergarten district, Berlin, Germany, Europe

Johannes Gutenberg monument, Deutsche Bahn German Railway skyscraper, Rossmarkt, Financial District, Frankfurt am Main, Hesse, Germany, Europe

View from Leipziger Platz square on Potsdamer Platz square with Deutsche Bahn German Railways Tower and the Sony Center, Mitte district, Berlin, Germany, Europe

View from Leipziger Platz square on Potsdamer Platz square with Deutsche Bahn German Railways Tower and the Beisheim Center buildings, Mitte district, Berlin, Germany, Europe

Metro, U-Bahn, U1 on Oberbaumbruecke bridge across the Spree river at dusk, Friedrichshain-Kreuzberg quarters, Berlin, Germany, Europe, PublicGround

Germany, Berlin, Potzdamer Platz, Bahn Tower.

Germany, Berlin, Potzdamer Platz with Berlin City sightseeing tour bus in the foreground and Bahn Tower in the background.

Germany, Berlin, Potzdamer Platz station with Bahn Tower behind.

Germany, Berlin, Potzdamer Platz, Bahn Tower fronted by a replica of the square's clock.