The ISS project has been going on since 1998, and in this short time-lapse animation, you can see how the whole thing was built up until today, with last module planned for delivery in 2015. The space station is HUGE and measures over 100 meters in length, 75 meters in width, and weigh over 400 tons!
The full assembly map for the International Space Station. Image source: ASA.
[yourjudgeandjury | Via IO9]