London Underground has created a series of Tube maps made entirely of Lego in celebration of the toy company's 150th anniversary.

"Each map is made up of more than 1,000 Lego bricks and took more than four days to build.

The first map shows how the Tube appeared in 1927. Another depicts it in 1933, when copies of Harry Beck's renowned diagram of the Underground was first distributed to the public. A version of Beck's design is still used today," reported CNN.

The tube is the oldest underground railway and was opened in 1863. In January the tube celebrated its 150th anniversary of the first underground journey.

"We hope the maps will inspire the young engineers of the future," said a London Underground spokesman to CNN.

The Tube is highly regarded as being one of the best public transportation systems in the world. The BBC reported that in commemoration of the anniversary, a steam train from the 19th century has returned to the tube.

Ticket  holders got to travel along part of the original Metropolitan line which is now the Hammersmith and City Line and traveled in a train that was pulled by a steam engine know as Met Locomotive No.1 built

Transport for London's website states that the first underground trip took place between Paddington and Farringdon on the Metropolitan Railway.

London Transport Museum and London Underground has an array of events in 2013 that explore the history of the tube and the roll it has in the future.

"The Tube plays a big part in the lives of Londoners, connecting people and places across the capital. 150 Londoners share their stories on the Evening Standard with examples of the positive impact the Tube has had on their lives," reported Transport for London.

Art on the Underground is a program that commissions art at various stations in London. During 2013 there will be a program that includes major commissions by an acclaimed British artist that will bring art to every station, reports TFL.