On Thursday I got six postcards: five from my visit to the United Nations in Vienna and one from Japan.
One of the cards from the United Nations shows the rotunda with the flags and on the right side the visitor centre of the Vienna International Centre. Without a guided tour the visitor centre is the only place to enter. It houses the post office of the United Nations, a flower shop, a hair salon and a cafe and they also sell greeting cards, souvenirs, crafts and gifts.
With a matching stamp:
Definitive (from set of two) (issued 06-06-2014)