The Stockholm Metro is often referred to as the world's longest art exhibition, and with roughly 90 stations featuring art, it certainly lives up to the description. Hence a Metro journey is a voyage into the world of art. Many of the stations were holistically designed from the start, some have been embellished with artworks, for example sculptures and mosaics, at a later stage, and in a few others the artworks are replaced every year. But art can also be seen in other parts of the public transport system, at commuter rail stations, a few bus terminals and at a number of light rail stations