The Semmering Railroad, designed and directed by the Venice born Carlo Ghega, is a UNESCO World Heritage Center (1998) that travels from Gloggnitz to Semmering. I was constructed between 1848 and 1854. At the. time the Semmering was a feat of engineering and the first mountain railway in Europe built on a standard gauge track. From your seat you see superb Austrian mountains, 16 viaducts and 15 tunnels, over 100 curved stone and 11 small iron bridges, as well as many mansions. All this in a journey of just 41 kilometers.