I enjoyed reading this revived thread (old ones are the best, maybe!) and was surprised it was a) so short, and b) not illustrated with a few more photos.
As I don't need much encouragement to post a photo or two and some relevant ones are already on my Imageshack, here are a few. A lot of my favourite landmarks have already been mentioned, but what about the Engelbert advert at the exit of La Source, and the white half tyres at Mexico?
The underbanking bridge at Monza from a more unusual angle:

The iconic palm trees at Monaco, as well as the surrounding high rises, by day:
And by night:

The pink buildings adjacent to the quay under "the Rock", seen here with an assortment of TNFers:

The other Melling Road crossing at Aintree, Anchor Crossing:

Some of the other horse racing ephemera at Aintree - the temporary pits and old grandstands were marvellous - this is just a poor reminder:

Don't forget the ubiqitous Canalside Concrete wall at Aintree...a unique landmark!
The unmistakeable pits at Rheims:

One of the unmistakeable grandstands too:

And the unmistakeable timing pavilion, together with surrounding countryside:

Rob
