The world's first underground railway opened in London in 1863, as a way of reducing street congestion.
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The London Underground first opened as an underground railway in 1863 and its first electrified underground line opened in 1890, making it the world's oldest metro system.
The Metropolitan line is the oldest underground railway in the world. The Metropolitan Railway opened in January 1863 and was an immediate success, though its construction took nearly two years and caused huge disruption in the streets. Read more about the Metropolitan line.
Inaugurated on 17 January, 1875, the Tünel is the second-oldest fully underground urban railway in the world, after the London Underground (1863) and oldest in continental Europe, pre-dating the Budapest Metro by 21 years. This diagram: view.
Glasgow Subway in Scotland is the world's third oldest metro system, opening in December 1896. The system runs along an underground 10.5km loop in the city and is one of the only metros in the world not to have been expanded beyond its original route.
There are around 180 subway systems across 178 cities and 56 countries in the world, with more being planned every year. From the grand old networks of London and Paris to the sleek, shiny subways of China, India and Japan, it's one of the most popular methods of mass urban transport.
Derinkuyu, Cappadocia, TurkeyCappadocia city, located in central Turkey, is home to no less than 36 underground cities, and at a depth of approx. 85 m, Derinkuyu is the deepest.
THE world's deepest metro system is the Pyongyang Metro in North Korea which is 110 meters deep. The tunnel was built as part of an underground military facility. THE world's deepest metro, underground station is the Arsenalna Station on the Kiev Metro in Ukraine, at 107 meters deep.
The cities of Özkonak, Derinkuyu, and Kaymakli in Cappadocia, Turkey, are some of the most complete (and most underground) of our underground cities. Denrikuyu is estimated to have once been capable of housing 20,000 people, and actually connects to Kaymakli via an underground tunnel, eight kilometers long.
Dixia Cheng, Beijing Underground City, ChinaThe Beijing Underground City, also known as Dixia Cheng, is an impressive engineering feat that lies beneath the bustling streets of Beijing, China. This vast network of tunnels and chambers spans over 33 square miles at a depth range of approximately 8-18 meters.
SubTropolis is a 55,000,000-square-foot (5,100,000 m2), 1,100-acre (4.5 km2) artificial cave in the bluffs above the Missouri River in Kansas City, Missouri, United States, that is claimed to be the world's largest underground storage facility.
HELSINKI -- Finland may be world's happiest country -- at least on the surface. But Helsinki's underground city tells a different story. Beneath the capital, a massive network of bunkers and tunnels spreads out all across the city.