First time at CoTA, we sat at Turn 11 back in 2012. Cool first time experience at the track, and there was more to see back then (Vintage F1, Porsche GT3, Ferrari 458 Challenge).
This year, we sat at Turn 12. Fewer races to see this year but view was much more exciting. Also, I highly recommend going up to the tower balcony during practice days / down time. $25 IIRC.
Pics from this year:
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