The wonderful thing about so-called open APIs is often the level of detail the data contain - effectively allowing developers to create all sorts of fascinating mashups.
Here is a particularly good example - using data from photo hosting and sharing service Panoramio, Estonian developer shop Bluemoon has plotted the location on a Google Map of every single image on the site.
The result, as Bluemoon says slightly , is the globe by "level of touristiness", a slightly awkward word but most people will know what it means.
Yellow areas on the map indicate high levels of images, red is medium, blue is low. Areas with no Panoramio images at all are grey.
Bluemoon says the results are established by analysing how many photos and by how many authors are in any given area.
The world:
North America:
Asia:
Europe:
NB:Try it out here.