Lego has done something rather special to celebrate the 150th year of the London Underground and remade four iconic versions of the map, each one made up of more than 1,000 lego bricks.

The 140 x 100 cm maps each took four days to build and go from 1927 the current 2013 map. They can be viewed at different stations across London, with most going on display from today.

The 1927 map can be seen in South Kensington, while Harry Beck's original design is on show in Picadilly Circus. Then you have the 1968 map in Green Park and the current 2013 offering - but made from Lego of course - in Stratford, east London.

The maps took  Duncan Titmarsh - one of only 13 Lego professionals worldwide - four days to build in each format.

This is the 150th year of the London Underground and these special Lego maps are just a few of the special exhibitions and artworks being shown across London. Lego itself is fairly old too, with the first Lego blocks appearing proper in 1947.