The idea of a gateway or portal to another world is common in myth and fantasy, and, obviously, far older than the use of the same notion in computing. While computing portals take researchers to other domains of data, the use of portals in myths is often far more complex. In creation myths, the passing of portals has immense consequences for humankind, as in Adam and Eve’s expulsion from their carefree existence in the Garden of Eden (unleashing the world’s woes upon their descendants), and in the carrying away of Persephone by Pluto into the Underworld (leaving a legacy of cold and sunless months each year). In other types of myths, and in the fantastic tales they have bequeathed, portals provide heroes with strange and wonderful adventures, and with experiences that leave heroes irrevocably changed. This article will now explore these types of portals in more detail.