How can i see a statistics about when the number of views increased over time?
I would like to find out if at a certain date there were a significant increase of views to one of my "famous" questions.
As of February 2013, this is technically not possible since views aren't tracked over time. (source: https://meta.stackexchange.com/a/168230/169611)
However, if the question and its answers have been accumulating a lot of votes, you can look at the timeline of the question to see if there any spikes.
An example timeline is: https://stackoverflow.com/posts/5859561/timeline
In this example, you can see that the question got a lot of attention on May 4,2012
In your case, it's likely that your two Famous Questions are attractive search engine hits. So people are coming via Google and such. In this case, the views would be coming in steadily over time and not in a single spike.