Austria, Vienna, Neubau District, The Vienna U Bahn sign for the Untergrundbahn or underground railway. White letter U on circular blue background.

France, Ile de France, Paris, Letter post box with Braille incription for the blind and a female hand reading the raised text.

Cuba, Havana, Centro Habana, Painting of Che Guevara along with two other portraits inside a revolutionary symbol and the letter A on a wall.

Professional letter writer with customers sitting at a desk outside the post office

Dead letter office at Australia Post with airmail post sorted by country.

Woman dictating to letter writer at stall outside post office.