Attached is a qvw containing a cleaned up data set of Summer Olympics Data (well, winter would have been better but I stumbled on this one). It only contains the data - no charts. You can use it to make your own visualizations.
The second file has some visualizations already, in case you wish to have a starting point. I say starting point as none of them are simple enough to be fully intuitive for all users.
Here is a link for inspiration - great charts (and some are even useful too): Explore Visualizations | visualizing.org
Would be great if you would share your creations!