Today I came across an iteresting website: ProgrammableWeb - because the world's is your programmable oyster. In their words:
ProgrammableWeb is where you can keep-up with the latest mashups, what's new and interesting with Web 2.0 APIs, and the Web as Platform in general. The core of the site is the blog and the 3 dashboards: Home, Mashups and APIs. All dashboards are updated daily.
It's worthwhile having a look at API part. And this is how I found
Quite nice app, good fun exploring the world without being scared of terrorism! And as you can see I had a few successful flights over the Sydney Opera House. But be careful! Do not fly too low, you can crash!