HINT: This city was once considered the centre of the world.
IT'S ROME! — The Rome Metro is the oldest of it's kind in Italy. It has 73 stations and covers 37.3 miles.
HINT: Last year's World Cup final took place here.
IT'S RIO DE JANEIRO! — The Brazilian city's network takes more than 1 million passengers a day, and is currently being extended ahead of next year's Olympics.
HINT: Probably the world's most famous underground railway map
IT'S LONDON! — The London Underground is considered to be the oldest rapid transport system on earth, and one of the busiest. It has an annual ridership of more than 1.2 billion.
HINT: The world's most powerful man lives here.
IT'S WASHINGTON DC! — Washington's Metro network has six different lines, and is the second busiest underground railroad in the USA. Only New York's subway is busier.
HINT: The birthplace of John F. Kennedy.
IT'S BOSTON! — The network is home to the Tremont Street Subway, the oldest underground railway tunnel in the whole of North America. It first opened in 1897!
HINT: One of Scandinavia's biggest cities.
IT'S COPENHAGEN! — Copenhagen's Metro is less than 15 years old and covers less than 15 miles, but it still gets 55 million passengers per year.
HINT: The third oldest underground railway on earth.
IT'S GLASGOW! — Of all the metro networks in the world, only the London Underground and Budapest Metro are older than Glasgow's. It opened in 1896.
HINT: The 1992 host of the Olympics.
IT'S BARCELONA! — There are eleven lines on Barcelona's Metro system, and many use driverless trains.
HINT: This system has tracks in both Europe and Asia.
IT'S ISTANBUL! — The network first opened in 1989, and is expanding rapidly. There are currently more than 30 stations under construction.
HINT: It's one of the largest metro networks in the world.
IT'S MOSCOW! — Russia's capital has the busiest metro system outside of Asia. Many of its stations are some of the deepest underground anywhere in the world.
HINT: The world's second-largest French-speaking city.
IT'S MONTREAL! — Montreal's Metro is unusual because its trains have rubber tires. These only feature on a small number of railways in the whole world.
HINT: Home to the famous Cowboys.
IT'S DALLAS! — The DART (meaning Dallas Area Rapid Transit) rail system has four separate lines. The Orange line — the newest on the network — was only finished last year.
HINT: It's in a place famous for french fries and mayonnaise.
IT'S BRUSSELS! — Metro stations in Belgium's capital are named in both French and Flemish making it easy for people from all over the country to know where they're going.
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