I hope I've not inadvertently posted this before, because it's so delightful. Jeff Cotton's "Fictional Cities: Venice Florence London" site examines the mix of fact and imagination in the experience of travel and living. It's one of my favorite ideas, certainly - that what goes on behind your eyes colors your perception of a place.
It also colors what you notice and remember. Which, if you're in Venice, might be the city's stray cats.