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. - learn about it / talk about it / deal with it At parents can find all the advice they will need to keep their children safe online. Designed specifically for parents, the site offers a wealth of up-to-date, unbiased information and advice about how to deal with online safety. Parents can learn about the latest issues and technologies, get great tips on how to talk about online safety with their children and get the best advice on dealing with issues and taking action. Created with experts, Internet Matters provides detailed information, but also signposts to best-in-class resources from individual expert organisations. Our goal is to ensure parents can always access the information that they need, in a format that is clear and concise.