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Commuters underneath streets of Pyongyang

Alexander F. Yuan / AP

Commuters ride on a subway train at Yonggwang station, or "glory station," in Pyongyang, North Korea, on Tuesday.

Foreign visitors are usually allowed to take only one stop, from Puhung station to Yonggwang station, on Pyongyang's north-south Chollima subway line.

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As chief Asia photographer for the Associated Press, David Guttenfelder has had unprecedented access to communist North Korea. Here's a rare look at daily life in the secretive country.