The Strange shrine is an object in the centre of the Maze, which can be touched to complete the random event. Players touching the shrine with a full inventory will be teleported back to their original location first, and then have their rewards dropped on the floor below their feet.
The shrine's examine text claims this object is a shrine of the gods. The human symbolising Saradomin, the skull symbolising Guthix, and the demon symbolising Zamorak.
A player reaching the exit of the Maze random event.
The three heads embedded into the statue are a reference to Saradomin (man), Zamorak (demon), and Guthix (skull) as they are depicted in the God Letters.