The ravenclaw tower is located on the west side of Hogwarts, the staircase leading up to the common room is presumably located on the fifth floor, and is the location of the ravenclaw common room and dormitories. The entrance to the room is at the top of a spiral staircase, and is a door without doorknob or keyhole but a bronze knocker in the shape of an eagle. In order to enter the room, you must answer a question asked by the eagle knocker; if you answer wrong, you must wait for someone who gets it right.

gryffindor tower is located behind the portrait of the fat lady on the seventh Floor of the castle. a password is required to enter it, which is spoken to the portrait.

the astronomy tower is the tallest tower at hogwarts surrounded by a parapet and turret. it is where students study the stars and planets through their telescopes in astronomy lessons

The owlery is located on the top of this tower. a tightly spiraling staircase leads from the bottom of the tower on the seventh floor up to a door leading out onto the battlements.