http://en.wikipedia.org/wiki/Nurburgring
"The Nürburgring, aka 'The Ring', is a race track in Nürburg, Germany. It is widely considered the toughest, most dangerous and most demanding purpose-built race track in the world. There are several fatalities and many accidents each year during public sessions. It is not unusual for the track to be closed several times a day for cleanup, repair, and medical intervention. The track management does not publish official fatality figures."
Other links with great info:
http://www.nurburgring.org.uk
http://www.nuerburgring.de/en.html