Vienna is an amazing cycling city - it's first rate cycling infrastructure like I've never seen before. It's probably one of the better ways to get around the city and so many people are riding past.
I therefore had to ride a bike and experience it for myself. It was a little too dangerous to be taking photos in the built up areas, but as I rode down to the Danube river some of the recreational cycling areas opened up to beautiful shots of the pathways and riverside.