All over Ireland fairy hills and raths are still respected as homes of the other world people. The leprechaun lives with the other characters of this world. Tradition tells us that fairies (Sí) in Ireland live among us and can often take human form. Many stories are told of humas who met fairies and went to live with them never to return to their earthly lives. Even into recent times people have seen strange sights and shadows of this world.
There are many, many other world creatures in Irish folklore which you can learn about at the museum, including the Púca, Fear Dearg, the Taibhse and the Banshee.