One of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

One of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

Punhung station, one of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

Punhung station, one of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

View from the TV Tower over the Monumental Axis or Central Avenue, UNESCO World Heritage Site, Brasilia, Federal district, Brazil, South America

Entrance to London Underground, Battersea Power Station, Battersea, London, England, United Kingdom, Europe

Metro, Porto, Norte, Portugal, Europe

One of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

Punhung station, one of the many 100 metre deep subway stations on the Pyongyang subway network, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia

Intercity-Express ICE train, fastest on the network, on Hohenzollern railway bridge, Cologne, North Rhine-Westphalia, Germany, Europe

LUAS urban public transport light rail tram system, city of Dublin, Republic of Ireland, Europe

Cruise ship moored at Harbourfront Centre, Singapore, with Sentosa Island resort behind and Sky Network cable car overhead, Singapore, Southeast Asia, Asia

The Strata building at the Elephant and Castle, the first building in the world to have wind turbines integrated into the fabric of the building, London, England, United Kingdom, Europe

Blurred view of technicians pushing cart in server room

Nanpu Bridge, Autobahnschleife vor dem Ueberqueren des Huangpu River, Kreisel, Auto, Verkehr, Stadtautobahn, motorway, circle, spirale, Betonspirale, Gaojia expressway to Pudong

Gaojia motorway, Gaojia, elevated highway system, bridge, im Zentrum von Shanghai, Expressway, network, interchange, junction, puzzle of concrete tracks

Metro Shanghai, Info screen, mass transportation system, subway, public transport, underground station, platformcommuters

Metro Shanghai, mass transportation system, subway, public transport, underground station, commuters

Metro Shanghai, mass transportation system, subway, public transport, underground station, Guard, commuters

High angle view of empty parallel electric railroad tracks, California

Travelers pull up alongside a lake in Bratislava to free camp for the night. A view from the bed in the back of the camper van; Bratislava, Bratislava Region, Slovakia

Young woman using tablet on plane

Young woman using tablet on plane