Sightsmap is a heat map of the world based on the number of photographs submitted to Panoramio.
The heatmaps are based solely on the number of available Panoramio photos for an area. The dark and the blue areas have fewer photos, the red areas have more and the yellow areas have a large number of photos geotagged.
As you zoom in on an area on the Google Map the heat map becomes more detailed and map markers appear for Wikipedia entries for locations and Foursquare venues.
Alexander Tchaikin has an interesting project on building photo density maps based on Panoramio photograph submission. The project's goal is to show on Google Maps the number of photos geo-tagged at particular locations. For example, the screenshot above shows the areas being photographed most in Paris.
Alexander explains how he created these photo density maps on his project website. He also has a number of kml files, so you can review the results of his analysis on Google Earth.
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