A whopper of an event with around 30,000 runners taking part in all of the individual races. It is Austria's largest running event which started out back in 1984 with just 794 entries. It is estimated that there are around 400,000 spectators around the course.
The race starts outside the UN Building on the outskirts of the city and finishes at Heldenplatz - one of the most beautiful squares in Vienna. There is plenty to see along the way including City Park, the Green Market, Vienna Theatre, the Museum of Technology, the State Opera and Schonbrunn Palace.