This is the track I pretty much grew up at in the '70s, Tom Thumb Raceway in Box Hill, Victoria here in Australia. It's long gone, but there are a couple of us still racing who remember it fondly. I worked there part time from the age of 13 to 16.
It was originally a kind of eight lane "double Figure 8", but the "Hillclimb" section was added in the late '60s and it became two four-lane tracks. It was tight and twisty. There was a sharp set of esses at the bottom of the hillclimb that lead into a 90 degree left turn, then into a tight slightly-banked 210° corner, onto a humped straight that ended at the notorious "Dunny Dip", an extremely tight, blind 210° corner that dropped away suddenly and went under the other four-lane track.
Visiting racers absolutely hated it, but the locals loved it!!! Once you mastered it, you could drive anywhere!
Looking at these pics, it's hard to believe we ran G12, G20, and Open State level races on it.
There aren't too many photos of the track, and because it was set up in two adjoining shops, it's hard to find a pic that captures the whole track.
The "Hillclimb" extension.
The view towards "Dunny Dip".
The "Hillclimb" under construction.
BTW: A "dunny" is Aussie slang for an outhouse. Dunny Dip was the corner nearest the toilets.