Just come across a really interesting interactive project from Estonian Professor, Tanel Tammet, called 'Sightsmap' which overlays a heatmap onto a Google map platform allowing users to pan and zoom around the globe to see the locations where the most intensely photographed areas in the world.

The heatmap is a representation of the number of available Panoramio photos for a given area. You can zoom into each location and then switch on the 'photo' view to see the images taken from each location. Furthermore, a drop down option lets you display markers for the most popular 5, 10, 100, etc. locations in the world.

What Tableau 7.0 brings to the data visualisation table
Visualising Data is on the move - offline for a short period