If you're looking for the ultimate driving thrill on the road, then the Nurburgring is almost certainly it. It's legally classed as a toll road for public driving sessions but is essentially a track where you can drive at any speed whilst observing the German road laws.
It's informally known as "The 'Ring" by petrol heads the world over but the formal name for the track is the "Nurburgring Nordschleife" which translates as "Nurburgring North Loop". The track is 13 miles long and there are 73 corners to negotiate so it's not for the faint hearted.
The track was originally the German formula one circuit but this came to an end after Niki Lauda's horrific accident in 1976. Nowadays it is used for track days, public driving days, manufacturer testing and for the occasional race series.
So, if you're looking for the ultimate adrenaline rush on the road this is it. However, be aware of the fact that this is a very dangerous road with frequent accidents, don't go without insurance and drive as if you don't have insurance and you'll be fine!