We went to Spa and Reims as part of last year's ring trip, and both have fantastic atmosphere.
Even driving the old Spa circuit will amaze you with regard to speeds those drivers were doing down those roads with all the trees/houses etc by the roadside.
The Reims pits are on a long straight road (obvious I suppose) and you can burble past at quite some speed. Awesome!
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Toyobaru 86 with Cosworth exhaust brakes and supercharger, Cosworth mapping, Eibach lowering springs, OZ alloys, fast road geo and various cosmetics. Great fun!