The folks at GP Circuits have mapped out 183 racing circuits from 27 championships in 36 countries, and they’ve wrapped them all inside of an excellent interface.
Along with providing stats, info and a great map view, every course is available in a “3D Fly-Through”, which races you along the track using the Google Earth Plugin.
The also include elevation data for each course, and photos when available. It’s quite a wealth of knowledge for those looking for info on circuits like these. As Google’s 3D Imagery continues to expand, sites like this will only get better!
Check it out for yourself at GPCircuits.com