The numbers 2, 4, 6, 8, 10, 12, 14 are stamps that came on the postcards from the listed countries.
These are some cards and postage stamps that were sent to me (about 7 years ago) from the cities and countries listed, and the pictures are not great, because I took them myself.
I belong to Postcrossing.com and it's free (except for the stamps and postcards) to send and receive cards.
It's really fun to read the messages and see the cards and stamps from around the world.
The image is Madrid, Spain.
