An Exploration of Biological Records
The Natural Science Museum of Barcelona has a growing database of 50,000 records of specimens collected over the past 150 years. Bestiario explores this data in their biodiversity treemap and geographical map.
The cool thing about the treemap is that you can zoom in iteratively through the Phylums, Classes, Orders, Families, etc. The interaction is similar to NYT's treemap that showed Obama's budget proposal from earlier this month, except there are a lot more levels, so you zoom, and then you zoom some more.