For the letter 'P' I have chosen Phone Booths and Post Boxes.
|A classic British telephone box near St. Paul's Cathedral|
[Creative Commons image. Source.]
Some telephone boxes that are no longer used have been converted for other uses, such as an art gallery called The Gallery on the Green and a library, Little Eaton Book Exchange. The Community HeartBeat Trust also has a project to turn telephone boxes into mini medical centres containing defibrillators! I think these are fantastic ideas.