Many stops along the U-Bahn are impressive, for example, the three million pieces of Murano that make up the murals by Anton Lehmden. And on lines U1, U2 and U3 you can admire works of art and installations by famous architects and artists, such as Ernst Candies, through to Peter Kogler and Gottfried Kumpf . We particualry like Karlsplatz station, designed by Otto Wagner.