In most cities with subway, the most common “decorations” are advertisements. And most stations are utilitarian structures that were designed without much aesthetic consideration. While things are totally different in Sweden. Running 110km underground in Stockholm’s Tunnelbana (subway) is the world’s longest art exhibition, with paintings, sculptures, mosaics and installations created by 150 artists since the 1950s in more than 90 of the city’s 100 stations. Stunning murals and playful art installations adorn the cave-like walls and ceilings. Click through to see some some of our favorite Stockholm Metro stations and find out more with the source links!