Not sure if this is gonna solve the problem, but I found a staircase that leads exactly where you wanted to go.
7 seconds sound clip from the Frozen movie soundboard.
You can hear this line at 00:52:18 in the Blu-ray version of the movie.
Quote context
[...]
- Ah... Please tell me I'm almost there.
- Does the air seem a bit thin to you up here?
- Hang on.
- Ha-ha! Thank goodness. Catch! Thanks.
- That was like a crazy trust exercise.
- Whoa.
- Now, that's ice. I might cry.
- All right, take it easy, boy. Come here. I got you.
[...]