The Stockholm Metro may not be the largest or the busiest, but it certainly is the most beautiful Metro in the world.
Each journey with Tunnelbana is an unimaginable experience, since it is an endless art gallery (the largest in the world) length of 110 kilometers.
Amazing artworks adorn the underground walls of 90 of the 100 subway stations, with mosaics, sculptures, and installations – from at least 150 artists.
There, on the walls of the most beautiful Metro in the world are written the verses of the famous Greek poet Yiannis Ritsos.
The specified fresco is located at Tensta station.
http://www.thetoc.gr/politismos/article/o-giannis-ritsos-kosmei-to-asullipto-metro-tis-stokxolmis-eikones