2. The Room of Requirement. This door appears whenever someone needs it, and it disappears when they no longer need it. The room can change its appearance to suit the needs of the person who is using it.
3. The Ministry of Magic. This door is located in a telephone box in London. It can only be used by wizards and witches who are of age.
4. The Death Room. This door is located in the Department of Mysteries. It is said to lead to a room where people can see their own deaths.