With its numerous interesting bridges and picturesque embankments, the river Ljubljanica gives the old centre of Ljubljana an unmistakable air. The river served as the city’s principal commercial artery and supply route from Roman times until the arrival of the railway in the mid-nineteenth century. The architect Jože Plečnik left a decisive mark on the city with his arrangement of the river embankments in the old town centre, designing tree-lined promenades and creating or renovating a series of bridges over the river and its tributaries. The Ljubljanica embankments are today a lively gathering place with numerous outdoor cafés.