Exemplary Data Visualization Site

Here the link to the website I chose:
http://quotes.post1.org/historical-crude-oil-price-chart/
The site tracks the price of a barrel of crude oil over different time spans. The interactive line graph shows the opening and closing prices of a barrel of crude each day. I like the fact that you can choose from different time spans with the buttons under the graph, so you can see the changes in price over the last 5 years or the last three months. I think it just helps give different perspectives seeing it over different time periods.