World's Longest Art Museum Metro Underground

The world’s longest Art Museum – the Stockholm Metro, called "the world’s longest underground art gallery". The Stockholm subway built in the 1940s, at that time, how to decorate each subway station was the question that the people was thinking, and later decided to let a hundred artists with their own style and art concept to decorate platform. The subway is total length of 108 km, each station is crafted work of art. Stockholm Metro (Stockholmstunnelba na) is the Stockholm Metro system, there are three main lines, 100 stations, where underground 47 stations, ground 53 stations. Several stations of the Stockholm Metro are broached in the rock.
Stockholm – the capital and largest city of Sweden; located in southern Sweden on the Baltic; "the Nobel Prize is awarded in Stockholm"