1. Dark pubs which have junk on all the walls and stacked on shelves, and mis-matched tables and chairs.
2. Pollarded trees. The older plane trees on the street where I work have had their branches taken off. They look like they've been packed up for winter.
3. Fly agarics - those red toadstools with white spots so loved by fairytale illustrators. I found a good patch of them in a clearing on my way home from work. The older ones have perfectly flat tops, while the new ones push out of the matted grass like little fists.