The White Ship by H.P. Lovecraft

"The White Ship" is a short story written by H.P. Lovecraft. It was first published in The United Amateur (Volume 19) #2, November 1919.
A lighthouse keeper named Basil Elton engages upon a peculiar fantasy in which a bearded man piloting a mystical white ship is found sailing upon a bridge of moonlight. Elton joins the bearded man on this ship, and together they explore a mystical chain of islands unlike anything that can be found on Earth.