Headmaster's Office

The entrance to the headmaster/mistress' office at Hogwarts is behind a statue of a gargoyle on the seventh floor. When given the proper password, the gargoyle will leap aside, and the wall behind it will split in two to reveal a spiral stone staircase that moves like an escalator. This staircase brings you to the second tallest tower at Hogwarts.

Gryffindor Tower

This is where the Gryffindor Domitories are located. There is a staircase in the common room that leads to these dormitories.