Imagine you are Bernie =:-o and you can nominate tracks to make a F1 season. In order to be more concrete, supose we have to choose 10 circuits. Don't worry about that "silly"
political thing about one GP per country. Don't worry about current level of safety measures. Think just in terms of layout, and, obviously, think about tracks that actually exist today.
My 10 circuits would be (in no particular order):
Spa
Suzuka
Interlagos (the old long track, I think it still exists)
Le Mans(!)
...Nurburgring... (the old, long one, I have to include it)
Mugello
Silverstone (the classic layout, I think the tarmac is yet there)
Paul Ricard (the original, not the silly short version)
Elkhart Lake (love!)
Monza (the classic no chicane version)
I admit the old Nurburgring is too unrealistic (very long to be safe). I love Le Mans (24h version) but perhaps I'd prefer to leave it just for the big event...
I think the old Zeltweg tarmac is gone forever, if it existed, I'd choose it. More or less the same with Clermont-Ferrand.
Brands Hatch, Hockenheim (without chicanes!), Pau, Montjuich, Sepang, Macau... are nice to me too.