What goes up must naturally come down again and the Queen's Staircase has it's beginning here. Today, it is located rather strangely among boutiques and an entrance but in times past it was ideally located for the Queen's usage. Like the remainder of the staircase itself it the vestibule is mainly made of marble. The vestibule itself benefits from a lot natural light from the high windows leading out into the Marble Courtyard.
Look from the staircase down towards the vestibule