There is a similar topic, with best races per F1 driver.
But what year saw the greatest GP at the F1 circuits current and old?
I'll take a look at the 2013 calendar to start with
AUS - Melbourne => 2006
MAL - Sepang => 2009 was great up to the red flag
CHI - Shanghai => 2006, 2007 for the drama
BAH - Sakhir => perhaps this year ?
ESP - Circuit de Catalunya => 1996
MON - Monte Carlo => 1982, 2004
CAN - Montreal => 1978 (coldest race ever?)
GBR - Silverstone => 1998
GER - Nürburgring => 1999
HUN - Hungaroring => 2006
BEL - Spa-Francorchamps => 2004 personally
ITA - Monza => don't like the track, but if I have to make a selection: 1988
SIN - Singapore => 2010
SKO - Yeongam => 2010
JAP - Suzuka => 2005
IND - Buddh International Circuit => none
AUH - Yas Marina => 2012
USA - Austin => obviously one choice
BRA - Interlagos => 2007 (as a Kimi fan), 2008 (what an ending), 2012 (drama throughout)