Elevated view of the Santiago metro, Santiago, Chile, South America

View of Kyoto Station interior during day, Shimogyo Ward, Higashishiokoji Kamadonocho, Kyoto, Honshu, Japan

View of subway entrance in Asakusa at night, Asakusa, Taito City, Tokyo, Honshu, Japan

Subway station, Grand-Pont, elevator and footbridge in Le Flon district with the Bel-Air Tower in background, Lausanne, Canton of Vaud, Switzerland

girls, Subway, entrance to Toei Oedo Line, in Roppongi station, Tokyo, Japan.

Dark tunnel

Graffiti in an underpass in Leoben, Styria, Austria, Europe

New Years Eve 2009 at the Brandenburg Gate, Berlin, Germany, Europe

Escalators, Tunnelbana subway station, Stockholm, Sweden, Scandinavia

Silhouette of the man in underground tunnel

Man approaching a group of menacing-looking youths in a dark pedestrian underpass

Illuminated pedestrian tunnel, walkway in the underground city of Montreal, Quebec, Canada, North America

Empty stairs in underground tunnel

Modern pedestrian underpass with surveillance cameras

Empty stairs in underground tunnel

Group of youths passing through a dark underpass

Man carrying a shopping bag in a pedestrian underpass

Pedestrian subway, Stuttgart, Baden-Wuerttemberg, Germany, Europe

Potsdamer Platz, building with light installation, Berlin, Germany

Motion Blur Of Passengers Walking On The Platform Beside The Moving Subway, New York City, New York, United States Of America