At the same time as the audiovisual presentation was installed in September 2010, a weapons room in the keep with an especially designed audio background opened to visitors.
Located near the centre of the Chillon rock, the keep probably dates from the 11th century.
A refuge tower and symbol of power, the keep was also used as a defence observation post, provisional residence, storehouse and, more recently, a prison and powder house.
For safety reasons the door of the keep, which is located high from the ground, could only be reached by a ladder or a drawbridge.
The height of the keep was raised for the first time at an unknown date and then a second time at the beginning of the 14th century to reach its current height (approx. 25 metres).
In the past only the first floor was habitable. During restoration of the keep in the 20th century, stairs were added to provide access to the top which has a 360° view over the castle and the surrounding area.