The Nurburgring Nordschleife is already the most gruelling, challenging and intense circuit to drive on in the world. Being the longest circuit in the world and featuring 154 corners (even more if you include the GP circuit which Formula 1 uses -- which this video does), not to mention passing through three German villages, how could it not be?
But, if you think that's hard, try driving around the circuit on snow. Not only would it be incredibly fun, your heart would be in your mouth the entire time. See this video for proof.
Also, slight side-note: this video reminds me of Project Gotham Racing 4 and a challenge in which you had to drive around the Nordschleife on, yep you guessed it, snow. It remains to this day one of my most cherished gaming memories. Make of that what you will.