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Marathon participants run over discarded paper cups that litter the pavement.
Marathon participants run over discarded paper cups that litter the pavement.
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A crowd of pedestrians walks through a busy terminal.
A crowd of pedestrians walks through a busy terminal.
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Traffic and pedestrians pass beneath a pagoda-style gate in Manila.
Traffic and pedestrians pass beneath a pagoda-style gate in Manila.
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Heavy traffic streams through intersections in New York City.
Heavy traffic streams through intersections in New York City.
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Colorful buses and other traffic turn off a narrow street in Manila.
Colorful buses and other traffic turn off a narrow street in Manila.
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Passengers crowd a train station terminal in Beijing.
Passengers crowd a train station terminal in Beijing.
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An aerial over Soweto, South Africa, reveals hundreds of homes.
An aerial over Soweto, South Africa, reveals hundreds of homes.
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A crowd of pedestrians walks along a linoleum floor.
A crowd of pedestrians walks along a linoleum floor.
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A surveillance monitor tracks traffic activity in New York City.
A surveillance monitor tracks traffic activity in New York City.
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Crowds of pedestrians walk along a busy New York City street.
Crowds of pedestrians walk along a busy New York City street.
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Passengers enter and exit a train station in Beijing.
Passengers enter and exit a train station in Beijing.
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Pedestrians crowd a plaza near the Forbidden City in Beijing.
Pedestrians crowd a plaza near the Forbidden City in Beijing.
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Passengers pass through a ticket line in a train station.
Passengers pass through a ticket line in a train station.
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A tattered towel hangs from a clothesline near a backyard shed.
A tattered towel hangs from a clothesline near a backyard shed.
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White apartment buildings crowd a neighborhood in Jerusalem.
White apartment buildings crowd a neighborhood in Jerusalem.
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Tenements crowd an urban neighborhood in Manaus.
Tenements crowd an urban neighborhood in Manaus.
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Roads and groves of trees appear to cut through the metropolis of Paris, France.
Roads and groves of trees appear to cut through the metropolis of Paris, France.
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A man pushes a dolly loaded with boxes past a lion statue on a busy street.
A man pushes a dolly loaded with boxes past a lion statue on a busy street.
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Houses crowd a neighborhood in Bandung, Indonesia.
Houses crowd a neighborhood in Bandung, Indonesia.
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Heavy traffic crosses an intersection at night.
Heavy traffic crosses an intersection at night.
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White apartment buildings crowd a hillside in Jerusalem.
White apartment buildings crowd a hillside in Jerusalem.
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Commuters use escalators in Grand Central Station.
Commuters use escalators in Grand Central Station.