Stockholm's metro isn't called the "world's longest art gallery" for nothing. From mosaics to paintings covering all sorts of themes, the city's metro is full of creativity.
Still, Tokyo's public transport is splendidly maintained, and easy to use for non-Japanese speakers as well. For these reasons, 94% of locals said the city was easy to navigate by public transport.
Prague wouldn't be Prague without the sight of a tram dashing in front of a Gothic church or Renaissance building. Then there's the metro, with its practical three lines covering almost every part of the city.