The Centaur by Algernon Blackwood

Slowly, taking life easily, the little steamer puffed its way across the Ionian Sea. The pyramid of Etna, bluer even than the sky, dominated the western horizon long after the heel of Italy had faded, then melted in its turn into the haze of cloud and distance. No other sails were visible.

With the passing of Calabria spring had leaped into the softness of full summer, and the breezes were gentle as those that long ago fanned the cheeks and hair of Io, beloved of Zeus, as she flew southwards toward the Nile. The passengers, less lovely than that fair daughter of Argos, and with the unrest of thinner adventure in their blood, basked lazily in the sun; but the sea was not less haunted for those among them whose hearts could travel. The Irishman at any rate slipped beyond the confines of the body, viewing that ancient scene as she had done, from above. His widening consciousness expanded to include it.