Castle Rock is a large monolith right off the coast of Arch Cape, Oregon.
It is named Castle Rock because it resembles a castle turret.
The rock is Basalt, formed millions of years ago from lava flows.
[1] It is sometimes called Queen Vic rock by locals, (referring to Queen Victoria) because on the west side, there is a rock pattern that loosely resembles the face of Queen Victoria.
[2]