Water Towers
East Anglia where I predominantly fight gravity has a plethora of tall, white circular edifices used to store water.
These erections stick out like the proverbial puppy's parts and can generally be spotted many miles away.
As there are very few areas where water towers are near each other they would be great VFR landmarks, if pinpointed on a chart.
The CAA chart folk often ask for suggestions but I will confess that I have never gotten off my ar$e and suggested this. Perhaps we should pick out the best suggestions from this thread and send it to the cartographers at the CAA?
Not sure how they will depict smoked pig, though!
Stik