The title, Letters, immediately made me think of the sort that you post and I remembered the delightful photo collection of mail boxes I made when in New England last Autumn. We don’t have letter boxes like these in Britain and I loved finding interesting and personalised mail boxes along our road trip. Click here if you would like to follow our road trip around New England in the Fall. Some photos were taken from a moving car when it wasn’t my turn to drive! Click on any image for a bigger version and here for others in the Challenge.
For more fascinating takes on this theme have a look here.