If you need excitement in Europe, I can recommend anywhere near or in Naples (Napoli) or Rome, Paris, Deutsche Autobahns and most of Eastern Europe and the Balkans.
I am aware that European roads as a whole are rather straightforwards compared to some parts (OK most) of the world. For starters we have rules and most of the time they are nearly obeyed. However the rules are often not quite the safe as the official ones.
For example, I discovered that around Napoli, you use your entire car as an indicator. Once you wedge it into a tiny gap then people will generally give way but you have to be very quick and accurate. It may be coincidental that when me and wifey started observing properly, that we estimated that around 90-95% of cars in that area had visible damage and were generally of fairly low value (in general).
When I gave a lift to an interview candidate at my company, who happened to be Polish, he remarked upon our habit of letting waiting cars out of side streets onto the main road. "That would not happen in Poland" he said, but I'm sure it does sometimes.
Speaking very, very generally, and given my experience does not extend to Scandinavia and quite a few other local-ish lands but does include US and Canada, I would tentatively suggest that the UK is generally a safe place to drive and is, generally, a forgiving driving environment. Our road signs are possibly the best anywhere but we do have too many signs in some places.
Driving in China would scare the shit out of me and I'm pretty confident behind the wheel.