First floor girls' lavatory tower

This tower is part of the Hogwarts Castle. It is located at the back of the Left Viaduct Tower, adjacent to the Viaduct Entrance. . The second floor of the tower hosts a girls' lavatory.

Moaning Myrtle's bathroom
This girls' lavatory is situated on the second floor of the tower. It has been out of order ever since a student named Myrtle was killed there. Myrtle has haunted the bathroom ever since, leading it to be a place most students do not want to enter. This bathroom holds the entrance to the Chamber of Secrets. To get in the Chamber, a person needs to say "open" in Parseltongue. This will cause the tap with a snake on the side (a tap which incidentally, never worked) to move into the floor, revealing a tunnel which leads downwards into the Chamber.

Appearances

 * Harry Potter and the Philosopher's Stone (film)
 * Harry Potter and the Philosopher's Stone (video game)
 * Harry Potter and the Chamber of Secrets (film)
 * Harry Potter and the Chamber of Secrets (video game)
 * Harry Potter and the Prisoner of Azkaban (film)
 * ''Harry Potter and the Prisoner of Azkaban (video game)
 * Harry Potter and the Goblet of Fire (film)
 * Harry Potter and the Order of the Phoenix (film)
 * Harry Potter and the Order of the Phoenix (video game)
 * Harry Potter and the Half-Blood Prince (film)
 * Harry Potter and the Half-Blood Prince (video game)
 * Harry Potter and the Deathly Hallows: Part 2