"The Ravenclaw Tower is located on the west side of Hogwarts, the staircase leading up to the common room is located on the fifth floor, and is the location of the Ravenclaw common room and dormitories. The entrance to the common room is at the top of a spiral staircase, and is a door without a doorknob or keyhole but a bronze knocker in the shape of an eagle. In order to enter the room, a person must answer a riddle asked by the eagle knocker; if they answer incorrectly, they must wait for someone else who gets it right."
The Board of Requirement
