I would come upon her wandering in the corridors at night.

6 seconds sound clip from the The Pit and the Pendulum (1961) movie soundboard.

You can hear this line at 00:22:17 in the Blu-ray version of the movie.

Quote context

[...]

- We dined, sometimes alone, enjoying intimate conversation, sometimes with the doctor.

- And every night, Elizabeth would play for me.

- Life was simple, quiet, richly pleasurable, and then the darkness began to fall.

- More and more, entering her room in the mornings, I would find her awake and discover that she had not slept all the night. I tried to find out why, but she had no explanation.

- Her appetite began to fade. She began to lose weight and color. I tried to make her eat, but something kept her from it.

- I would come upon her wandering in the corridors at night.

- I tried to find out what was wrong, but she never had an answer except to say that... that something was oppressing her.

- Oh, God, help me for my blindness. I should have known.

- And then, one day, she disappeared. Frantic, I... I searched the castle for her.

- And then I knew... the castle and its awful history had obsessed her.

[...]