The International Space Station (ISS) is the largest human-made body in low Earth orbit. It has been inhabited continously since November 2000 and NASA is considering allowing tourists to visit it!
Open Notify is a collection of NASA and space APIs for public use, developped by Nathan Bergey.
The GeoNames geographical database covers all countries and contains over eleven million placenames that can be downloaded or accessed via their web services.
Want to know where the ISS is right now? Check out my project page here.