Postcards are a universal language in the islands, and are often used by locals to share memories and feelings.

But what is it about them that we love?

Postcards have a lot to teach us about our world and our place in it.

Postcards from the 1940s show the islanders at war in the Pacific and their islander allies at war on the mainland.

They show how the islands people have evolved in the last century and how they have changed over the years.

Here are some of our favourite postcards from around the world.

Read more postcards on RTE.