Firstly opened in 1950 and with its 110 km long tunnels is the Stockholm´s metro being called “the longest art gallery in the world”. Visitors of Moscow´s subway might be against, but the prove for creativity of Swedish builders cannot be taken away! The originality of the artistic approach towards the exposed rocks of the metro tunnels takes the breath away… Check it out yourself!
Picture resource: www.visualnews.com (http://www.visualnews.com/2011/02/12/the-stockholm-subway-takes-art-underground/