Lake Leman lies by Chillon's walls:
A thousand feet in depth below
Its massy waters meet and flow;
Thus much the fathom-line was sent
From Chillon's snow-white battlement.
  Which round about the wave inthrals:
A double dungeon wall and wave
Have made -- and like a living grave.
Below the surface of the lake
The dark vault lies wherein we lay:
We heard it ripple night and day;
  Sounding o'er our head it knock'd;
And I have felt the winter's spray
Wash through the bars when winds were high,
And wanton in the happy sky;
  And then the very rock hath rock'd
  And I have felt it shake, unshock'd, 
Because I could have smiled to see
  The death that would have set me free.

                     George G. Lord Byron
                     from The Prisoner of Chillon