On January 9, 2013, the world's first underground journey took place in London.
According to the London Transport Museum:
The original Underground line was built and financed by the Metropolitan Railway, a private company which had been formed in 1854 to undertake the project to link the mainline stations at Paddington, Euston and King’s Cross with the City centre business district to the east.
Travelling on the new railway was a novelty that thousands of Londoners were eager to experience and on the first day of public service – long queues formed at every station. The line was a huge success with 26,000 passengers using the railway each day in the first six months.
In 1969, Queen Elizabeth opened a section of the Victoria Line and actually took the controls. According to press reports, it was her second time riding the Tube.
But she didn't just ride. The queen apparently also took the controls.
Carriage 353 was a four-wheeled first class carriage built in 1892. Amazingly, it had been "relegated to use as a garden shed." Check out a video of its history -- and restoration process -- below.
Here's what the interior of a 1938 car looked like:
To celebrate the 150th anniversary, Google UK blessed its site with an Underground-themed Doodle.
Today, Transport for London estimates around 3.5 million journeys are made on the network each day, across 11 lines serving 270 stations.