A couple hugs in front of a stained glass panel in Novoslobodskaya metro station, which was built in 1952, in Moscow August 17, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 17, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: TRANSPORT SOCIETY)

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People walk near the entrance to Arbatskaya metro station, which was built in 1953, in Moscow August 17, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 17, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: TRANSPORT SOCIETY)

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People walk through Prospekt Mira metro station in Moscow August 14, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 14, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: TRANSPORT SOCIETY)

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A ceiling panel is seen in Novoslobodskaya metro station, which was built in 1952, in Moscow August 17, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 17, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: TRANSPORT SOCIETY)

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Two men in matching shirts travel down an escalator at a metro station in Moscow August 12, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 12, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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A woman walks on the platform as a train arrives at Mayakovskaya metro station, which was built in 1938, in Moscow August 17, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 17, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: SOCIETY TRANSPORT TPX IMAGES OF THE DAY)

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A stained glass panel is seen in Novoslobodskaya metro station, which was built in 1952, in Moscow, August 17, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 17, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: TRANSPORT SOCIETY)

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A woman and a man hold their heads as they walk toward a train at a Russian Metro station in Moscow August 11, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 11, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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A woman reads a magazine in Chistye Prudy metro station in Moscow August 16, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 16, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: TRANSPORT SOCIETY)

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Two women make their way to a train at a Russian Metro station in Moscow August 11, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 11, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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Men use their mobile phones as they stand in front of a mosaic depicting former Soviet leader Vladimir Lenin at Biblioteka Imeni Lenina metro station in Moscow August 13, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 13, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: SOCIETY TRANSPORT TPX IMAGES OF THE DAY)

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A woman touches the nose of the "lucky dog" statue at the Ploshchad Revolyutsii Metro station in Moscow, August 14, 2013. Commuters believe that rubbing the nose of the bronze dog statue will bring them good luck. REUTERS/Phil Noble (RUSSIA - Tags: SOCIETY TRAVEL SPORT SOCCER)

A map of the Moscow metro system is seen behind a poster warning passengers to avoid the closing doors on a metro train in Moscow August 17, 2013 To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 17, 2013. REUTERS/Phil Noble (RUSSIA - Tags: TRANSPORT SOCIETY)

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A woman works at a news-stand in the Moscow metro August 14, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 14, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: SOCIETY TRANSPORT BUSINESS)

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A train driver pulls into Biblioteka Imeni Lenina metro station in Moscow August 14, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 14, 2013. REUTERS/Lucy Nicholson (RUSSIA - Tags: TRANSPORT SOCIETY)

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Two couples embrace as they travel on a train on the metro in Moscow August 10, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 10, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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Passengers travel on a late night train on the metro in Moscow August 11, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 11, 2013. REUTERS/Phil Noble (RUSSIA - Tags: TRANSPORT SOCIETY)

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Passengers travel on a late night train on the metro in Moscow August 11, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 11, 2013. REUTERS/Phil Noble (RUSSIA - Tags: TRANSPORT SOCIETY)

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Two police officers travel on a train at a metro station in Moscow August 15, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 15, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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Two women read a book as they sit in a train on the metro in Moscow August 10, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 10, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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A couple share a light moment as they sit on a train at a metro station in Moscow August 12, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 12, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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A couple embraces on a train on the metro in Moscow August 17, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 17, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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A couple shares earphones as they listen to music on a train on the metro in Moscow August 17, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 17, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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Passengers walk down a concourse at a metro station in Moscow August 10, 2013. To step onto the Moscow metro is to step back in time and immerse yourself in a museum rich in architecture and history. Opened in 1935, it is an extravagant gallery of Communist design, featuring Soviet artworks, statues, chandeliers, stained glass and ceiling mosaics. Built under Stalin, the metro now transports 7 to 9 million people a day and costs 30 Rubles, around $1, for a single ride. Picture taken August 10, 2013. REUTERS/Dylan Martinez (RUSSIA - Tags: TRANSPORT SOCIETY)

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