The new tracks that have just started construction near me at Badlands Motorsports Resort have a good chance of being near the top in North America:
https://badlandsmotorsportsresort.com/
They are designed by Alan Wilson who also designed Mont Tremblant and about 3 dozen other tracks around the world. The valley track in particular has lots of elevation changes with one turn with 12 degrees downward slope through the turn that has about 25m / 80 feet elevation change to the next turn.
I’ve had my membership deposit down for a couple of years, they are currently projecting the first circuit paving to be complete by Sept, depending on Covid complications.