When my wife and I lived in Bristol we developed a metric designed to measure how enjoyable a city was to live in that we called "time to sheep". Basically it's a measure of how long you have to travel from the center of the city before you're in the English countryside surrounded by sheep and the best cities have a low (but not too low) "time to sheep" metric. It helped explain one of the reasons we loved living in…
Curious, because of geography? architecture?